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OpenSplice DDS
                                        Delivering Performance, Openness, and Freedom


Angelo Corsaro, Ph.D.
      Chief Technology Officer


                                 A Gentle Introduction
        OMG DDS SIG Co-Chair
angelo.corsaro@prismtech.com
OpenSplice DDS
Delivering Performance, Openness, and Freedom




               “Historical” Perspective
Addressing Data Distribution Challenges
                                                          DDS is standard designed to address the data-distribution challenges across
The OMG DDS Standard                                                             a wide class of Defense and Aerospace Applications
‣ Introduced in 2004 to address the Data
  Distribution challenges faced by a wide
  class of Defense and Aerospace
  Applications
‣ Key requirement for the standard were its
  ability to deliver very high performance while
  seamlessly scaling from embedded to ultra-
  large-scale deployments
‣ Today recommended by key administration
  worldwide and widely adopted across
  several different application domains, such
  as, Automated Trading, Simulations, SCADA,
  Telemetry, etc.

                                                © 2009, PrismTech. All Rights Reserved
The OMG Data Distribution Service (DDS)

DDS v1.2 API Standard
‣ Language Independent, OS and HW architecture                                                        Application

    independent                                                                                           Object/Relational Mapping

‣   DCPS. Standard API for Data-Centric, Topic-                                                    Data Local Reconstruction Layer (DLRL)

    Based, Real-Time Publish/Subscribe
                                                                                                                              Content
‣
                                                                                     Ownership           Durability
    DLRL. Standard API for creating Object Views out                                                                        Subscription

    of collection of Topics                                                                          Minimum Profile

                                                                                          Data Centric Publish/Subscribe (DCPS)
DDSI/RTPS v2.1 Wire Protocol Standard
‣ Standard wire protocol allowing interoperability
                                                                                           Real-Time Publish/Subscribe Protocol

                                                                                             DDS Interoperability Wire Protocol
    between different implementations of the DDS
    standard                                                                                              UDP/IP

‣   Interoperability demonstrated among key DDS
    vendors in March 2009
                                            © 2009, PrismTech. All Rights Reserved
DDS!Recommendations is churning…
     The infrastructure evolution cycle
                – New -> Emerging -> Standard -> Commodity
Increasingly Mandated/Recommended by Administrations
                – Middleware is emerging as OS declines
          ! …DDS is maturing…
‣ US Navy: Open Architecture
                – OMG focus
                – Wire spec




                                                                    Proprietary Information - Distribution without Expressed Written Permission is Prohibited.
‣ DISR/DISA: Net-centric Systems
                – Tools
                – Enterprise integration
                – Multiple products fielded
‣ EuroControl:– Deployed applications!
                 Air Traffic Control Center Operational
  Interoperability
          ! …and adoption is on the rise
                – Navy
                – DISR
‣ QinetiQ: Recommending DDS for VSI
                – FCS/SoSCOE
                           © 2009, PrismTech. All Rights Reserved
OpenSplice DDS
Delivering Performance, Openness, and Freedom




                   As Simple as it Gets
As Simple as it Gets
‣ DDS is based around the concept
 of a fully distributed Global Data
 Space (GDS)



                                                                               Global Data Space




                                                                                     DDS



                                      © 2009, PrismTech. All Rights Reserved
As Simple as it Gets
‣ DDS is based around the concept
 of a fully distributed Global Data
 Space (GDS)
‣ Publishers and Subscribers can
 join and leave the GDS at any time
                                                                               Global Data Space




                                                                                     DDS



                                      © 2009, PrismTech. All Rights Reserved
As Simple as it Gets
‣ DDS is based around the concept
 of a fully distributed Global Data
                                         Publisher                                                 Subscriber
 Space (GDS)
‣ Publishers and Subscribers can
 join and leave the GDS at any time
                                                                                                    Subscriber
                                       Publisher
                                                                               Global Data Space




                                          Publisher                                                Subscriber

                                                                                     DDS



                                      © 2009, PrismTech. All Rights Reserved
As Simple as it Gets
‣ DDS is based around the concept
 of a fully distributed Global Data
                                         Publisher                                                 Subscriber
 Space (GDS)
‣ Publishers and Subscribers can
 join and leave the GDS at any time
                                                                                                    Subscriber
‣ Publishers and Subscribers           Publisher
                                                                               Global Data Space
 express their intent to produce/
 consume specific type of data,
 e.g., Topics
                                          Publisher                                                Subscriber

                                                                                     DDS



                                      © 2009, PrismTech. All Rights Reserved
As Simple as it Gets
‣ DDS is based around the concept
 of a fully distributed Global Data
                                         Publisher                                                 Subscriber
 Space (GDS)
‣ Publishers and Subscribers can
 join and leave the GDS at any time
                                                                                                    Subscriber
‣ Publishers and Subscribers           Publisher
                                                                               Global Data Space
 express their intent to produce/
 consume specific type of data,
 e.g., Topics
                                          Publisher                                                Subscriber

                                                                                     DDS



                                      © 2009, PrismTech. All Rights Reserved
As Simple as it Gets
‣ DDS is based around the concept
  of a fully distributed Global Data
                                          Publisher                                                 Subscriber
  Space (GDS)
‣ Publishers and Subscribers can
  join and leave the GDS at any time
                                                                                                     Subscriber
‣ Publishers and Subscribers            Publisher                               Global Data Space
  express their intent to produce/
  consume specific type of data,
  e.g., Topics
                                                                                                    Subscriber
‣ Data flows from Publisher to             Publisher

  Subscribers                                                                         DDS



                                       © 2009, PrismTech. All Rights Reserved
As Simple as it Gets
‣ DDS is based around the concept
  of a fully distributed Global Data
                                          Publisher                                                 Subscriber
  Space (GDS)
‣ Publishers and Subscribers can
  join and leave the GDS at any time
                                                                                                     Subscriber
‣ Publishers and Subscribers            Publisher                               Global Data Space
  express their intent to produce/
  consume specific type of data,
  e.g., Topics
                                                                                                    Subscriber
‣ Data flows from Publisher to             Publisher

  Subscribers                                                                         DDS



                                       © 2009, PrismTech. All Rights Reserved
OpenSplice DDS
Delivering Performance, Openness, and Freedom




                           Defining Data
DDS Topics
                                                                                   {Circle, Square, Triangle}
Topic
‣ Unit of information exchanged between
  Publisher and Subscribers.
‣ An association between a unique name, a
  type and a QoS setting                                                     {ShapeType}                        {...}


Topic Type.
                                                                             struct ShapeType {
‣ Type describing the data associated with one                                  long   x;
  or more Topics                                                                long   y;
‣ A Topic type can have a key represented by an                                 long   shapesize;
                                                                                string color;
  arbitrary number of attributes                                             };
‣ Expressed in IDL                                                           #pragma keylist ShapeType color

                                    © 2009, PrismTech. All Rights Reserved
DDS Topics


                                                    Circle


struct ShapeType {
   long   x;
   long   y;
   long   shapesize;                                 Topic                 QoS
   string color;
};
#pragma keylist ShapeType color




                                  © 2009, PrismTech. All Rights Reserved
DDS Topics


                                                 Triangle



struct ShapeType {
   long   x;
   long   y;
   long   shapesize;                                 Topic                 QoS
   string color;
};
#pragma keylist ShapeType color




                                  © 2009, PrismTech. All Rights Reserved
DDS Topic Instances and Samples
Topic Instances
‣ Each key value identifies a unique Topic Instance,
‣ Topic’s instance lifetime can be explicitly
 managed in DDS

Topic Samples
‣ The values assumed by a Topic Instance
 over time are referred as Instance Sample
                   struct ShapeType {
                      long   x;
                      long   y;
                      long   shapesize;
                      string color;
                   };
                   #pragma keylist ShapeType color
                                       © 2009, PrismTech. All Rights Reserved
Topic/Instances/Samples Recap.
   Topics                                                         Instances




                 Samples



            ti     tj                                      tnow       time
                  © 2009, PrismTech. All Rights Reserved
Content Filtering
                                                                               X0                   X1
                                                                                    X0 <= X <= X1
‣ DDS allows to specify content-
 filtered Topics for which a subset
 of SQL92 is used to express the
 filter condition
                                                                      Y0
‣ Content filters can be applied on
 the entire content of the Topic Type                 Y0 <= Y <= Y1

‣ Content filters are applied by DDS
                                                                      Y1
 each time a new sample is
 produced/delivered

                                      © 2009, PrismTech. All Rights Reserved
Filtering Market Data
                               AAPL < $157 | | AAPL > $162                                         MSFT > $35
                       Apple
        164.0                                                                          Microsoft
                                                                                  40


        161.5
                                                                                  30


        159.0

                                                                                  20

        156.5

                                                                                  10

        154.0

                                                                                   0
                       AAPL                                                                 MSFT



‣ DDS continuous queries can be used for filtering the stream of data produced for a
  specific stock symbol.

                                         © 2009, PrismTech. All Rights Reserved
Local Queries
‣ Subscribed Topics can be seen locally as “Tables”
‣ A subset of SQL92 can be used for performing queries on                            X0
 multiple topics as well as natural joins
‣ Queries are              Circle Topic
 performed under                                                                                      Y0
                            color    x               y             shapesize                 Y0
 user control and            red    57              62                50
 provide a result that      blue    90              85                50
                                                                                      Y0 <= Y <= Y1
 depends on the            yellow   30              25                50

 current snapshot of            SELECT * FROM ShapeType s
                                WHERE s.x > 25 AND s.y < 55                                  Y1
 the system, e.g.,
 samples currently          color    x               y             shapesize
 available                 yellow   30              25                50


                                            © 2009, PrismTech. All Rights Reserved
OpenSplice DDS
Delivering Performance, Openness, and Freedom




                        Organizing Data
DDS Partitions

‣ All DDS communication is                                           Domain
                                                                                          Partition

  happens within a Domain
‣ Domain can divided into    Publisher
                                                                                                        Subscriber

  Partitions                                                                  B

‣ Topics are published and                                                        m

  subscribed across on or                                                     A           F

                                                                                                          Subscriber
  more Partitions            Publisher                                        J
                                                                                      D          C


                                                                              K
                                                                                      E




                             Publisher
                                                                                                      Subscriber



                                     © 2009, PrismTech. All Rights Reserved
OpenSplice Network Partitions
‣ OpenSplice DDS allows to            Publisher
                                                                                                                          Subscriber
    define network partitions along                                                     "Red"
                                                                                    B
    with DDS partitions
                                                                                             m

‣   Network partitions are bound to                                                 A                F

    a list of unicast/multicast       Publisher                                     J
                                                                                                          "Green"           Subscriber
    network addresses                                                                            D          C



‣   Partition.Topic combination can                                                 K
                                                                                                 E
                                                                                  "Yellow"
    be mapped into OpenSplice
    DDS Network Partitions            Publisher
                                                                                                                        Subscriber
‣   Wildcards can be used when
    defining the mapping, and in
                                                 Yellow.* => 224.1.1.1                           Green.* => 224.1.1.2
    case of multiple matches                                                                     Green.E => 224.1.1.3
    OpenSplice DDS will always
    consider the best match

                                         © 2009, PrismTech. All Rights Reserved
OpenSplice DDS
Delivering Performance, Openness, and Freedom




                      Quality of Service
Anatomy of a DDS Application

                                                             Topic
                                                              Topic
                                                               Topic
                                                                    Samples
                                                                     Samples
               Instances                                              Samples
                Instances
                 Instances
                                         121 62
                                             1
                                           21 62
                                                   1 22 62
                                                     1 22 62
                                                               1 23 63
                                                                1 23 63
  DataReader
  DataReader
                                          1 21 62
                                        2 20 61
                                                       1 22 62
                                                  2 19 60
                                                                 1 23 63
   DataReader
    DataReader                           2 20 61
                                          2 20 61
                                                    2 19 60
                                                      2 19 60                             DataWriter
                                                                                          DataWriter
     DataReader
      DataReader                        3 25 70   3 25 71
                                                      25       3 25 74   3 26 77
                                                                          3 26 77
                                                                                           DataWriter
                                                                                            DataWriter
                                         3 25 70    3 25 71
                                                        25      3 25 74
                   struct TempSensor {    3 25 70     3 25 71
                                                         25      3 25 74   3 26 77
                      int tID;
                      float temp;
                      float humidity;
                   };
                   #pragma keylist TempSensor tID




                                                 © 2009, PrismTech. All Rights Reserved
Anatomy of a DDS Application

                                                                            Topic
                                                                             Topic
                                                                              Topic
                                                                                   Samples
                                                                                    Samples
                              Instances                                              Samples
                               Instances
                                Instances
                                                        121 62
                                                            1
                                                          21 62
                                                                  1 22 62
                                                                    1 22 62
                                                                              1 23 63
                                                                               1 23 63
               DataReader
               DataReader
                                                         1 21 62
                                                       2 20 61
                                                                      1 22 62
                                                                 2 19 60
                                                                                1 23 63
                DataReader
                 DataReader                             2 20 61
                                                         2 20 61
                                                                   2 19 60
                                                                     2 19 60                              DataWriter
                                                                                                          DataWriter
                  DataReader
                   DataReader                          3 25 70   3 25 71
                                                                     25       3 25 74   3 26 77
                                                                                         3 26 77
                                                                                                           DataWriter
                                                                                                            DataWriter
                                                        3 25 70    3 25 71
                                                                       25      3 25 74
                                  struct TempSensor {    3 25 70     3 25 71
                                                                        25      3 25 74   3 26 77
                                     int tID;
                                     float temp;
Arrows                            };
                                     float humidity;

show                              #pragma keylist TempSensor tID

structural
relationship
s, not data-         Subscriber                                                                          Publisher
flows                                                                    Partition




                                                                © 2009, PrismTech. All Rights Reserved
Anatomy of a DDS Application

                                                                            Topic
                                                                             Topic
                                                                              Topic
                                                                                   Samples
                                                                                    Samples
                              Instances                                              Samples
                               Instances
                                Instances
                                                        121 62
                                                            1
                                                          21 62
                                                                  1 22 62
                                                                    1 22 62
                                                                              1 23 63
                                                                               1 23 63
               DataReader
               DataReader
                                                         1 21 62
                                                       2 20 61
                                                                      1 22 62
                                                                 2 19 60
                                                                                1 23 63
                DataReader
                 DataReader                             2 20 61
                                                         2 20 61
                                                                   2 19 60
                                                                     2 19 60                              DataWriter
                                                                                                          DataWriter
                  DataReader
                   DataReader                          3 25 70   3 25 71
                                                                     25       3 25 74   3 26 77
                                                                                         3 26 77
                                                                                                           DataWriter
                                                                                                            DataWriter
                                                        3 25 70    3 25 71
                                                                       25      3 25 74
                                  struct TempSensor {    3 25 70     3 25 71
                                                                        25      3 25 74   3 26 77
                                     int tID;
                                     float temp;
Arrows                            };
                                     float humidity;

show                              #pragma keylist TempSensor tID

structural
relationship
s, not data-         Subscriber                                                                          Publisher
flows                                                                    Partition

                                                                Domain Participant

                                                                         Domain
                                                                © 2009, PrismTech. All Rights Reserved
QoS Model
‣ QoS-Policies are used to control relevant
  properties of OpenSplice DDS entities,                                                                Type Matching
                                                                                                                                           QoS matching
  such as:                                   QoS              QoS                      QoS                          QoS                   QoS                QoS              QoS

  ‣ Temporal Properties
  ‣ Priority
                                                                                                                    Topic
                                                                                                                              Name
                                                            Publisher                                                                                     Subscriber


  ‣ Durability                                                               ...    DataWriter             writes   Type       reads   DataReader
                                                                                                                                                    ...
                                                                                                                        ...
  ‣ Availability                               DomainParticipant                                         writes     Type      reads    DataReader                  DomainParticipant
                                                                                    DataWriter
  ‣ ...                                                                                                                       Name


‣ Some QoS-Policies are matched based on
                                                                                                                    Topic


                                                                                       QoS                          QoS                    QoS
  a Request vs. Offered Model thus QoS-
  enforcement

‣ Publications and Subscriptions match only if the declared vs. requested QoS are compatible
 ‣ e.g., it is not possible to match a publisher which delivers data unreliably with a subscriber which requires reliability
                                                               © 2009, PrismTech. All Rights Reserved
QoS Policies
QoS Policy           Applicability   RxO   Modifiable                                                                                         Type Matching
                                                                                                                                                                                QoS matching
DURABILITY            T, DR, DW       Y       N                   Data Availability             QoS             QoS                QoS                   QoS                   QoS                QoS              QoS

DURABILITY SERVICE      T, DW        N        N
                                                                                                                                                         Topic
                                                                                                                                                                   Name
                                                                                                              Publisher                                                                        Subscriber

LIFESPAN                T, DW         -       Y                                                                           ...   DataWriter      writes   Type       reads   DataReader
                                                                                                                                                                                         ...

                      T, DR, DW      N        N                                                                                                              ...
HISTORY
                                                                                                 DomainParticipant              DataWriter    writes     Type      reads    DataReader                  DomainParticipant
PRESENTATION             P, S         Y       N                     Data Delivery                                                                                  Name
                                                                                                                                                         Topic
RELIABILITY           T, DR, DW       Y       N
PARTITION                P, S        N        Y                                                                                   QoS                    QoS                    QoS



DESTINATION ORDER     T, DR, DW       Y       N


OWNERSHIP             T, DR, DW       Y       N                                                          ‣ Rich set of QoS allow to configure
OWNERSHIP                DW           -       Y
STRENGTH                                                                                                         several different aspects of data
DEADLINE              T, DR, DW       Y       Y                   Data Timeliness                                availability, delivery and timeliness
LATENCY BUDGET        T, DR, DW       Y       Y


TRANSPORT PRIORITY      T, DW         -       Y
                                                                                                         ‣       QoS can be used to control and
                                                                                                                 optimize network as well as
TIME BASED FILTER        DR           -       Y                       Resources
                                                                                                                 computing resource
RESOURCE LIMITS       T, DR, DW      N        N


USER_DATA            DP, DR, DW      N        Y                     Configuration
TOPIC_DATA                T          N        Y
GROUP_DATA               P, S        N        Y

                                                       © 2009, PrismTech. All Rights Reserved
Mapping QoS                                                                           Which properties does QoS controls?



     TimeBasedFilter         Deadline



                              Data
       Throughput
                             Latency



      LatencyBudget      TransportPriority




                                                                                                                        Proprietary Information - Distribution without Expressed Written Permission is Prohibited.
    Control over Latency/Throughput tradeoff
    Control over data latency
    Control over data priority




                                             © 2009, PrismTech. All Rights Reserved
Mapping QoS                                                                                                  Which properties does QoS controls?



     TimeBasedFilter         Deadline                                                        History



                              Data                                                           Data
       Throughput                                                           Lifespan                        Durability
                             Latency                                                       Availability


                                                                            Ownership
      LatencyBudget      TransportPriority                                                 Ownership
                                                                             Strength




                                                                                                                                               Proprietary Information - Distribution without Expressed Written Permission is Prohibited.
    Control over Latency/Throughput tradeoff
                                                                            Control over data queueing
    Control over data latency
                                                                            Control over data persistency
    Control over data priority
                                                                            Control over data sources hot-swap




                                             © 2009, PrismTech. All Rights Reserved
Mapping QoS                                                                                                               Which properties does QoS controls?



       TimeBasedFilter                  Deadline                                                          History



                                         Data                                                             Data
         Throughput                                                                      Lifespan                        Durability
                                        Latency                                                         Availability


                                                                                         Ownership
        LatencyBudget            TransportPriority                                                      Ownership
                                                                                          Strength




                                                                                                                                                            Proprietary Information - Distribution without Expressed Written Permission is Prohibited.
     Control over Latency/Throughput tradeoff
                                                                                         Control over data queueing
     Control over data latency
                                                                                         Control over data persistency
     Control over data priority
                                                                                         Control over data sources hot-swap


                          Reliability
                                                                                     OpenSplice DDS provides programmatic
                                                   Destination
                                                                                     QoS-driven support for configuring the most
   Presentation          Data Delivery
                                                     Order                           important properties of data distribution!
       Control over data distribution reliability
       Control over data ordering
       Control over presentation


                                                          © 2009, PrismTech. All Rights Reserved
Reliability
The reliability with which data is delivered to applications is impacted in DDS by the
following qualities of service
‣ RELIABILITY
 ‣ BEST_EFORT
 ‣ RELIABLE
‣ HISTORY
 ‣ KEEP_LAST (K)
 ‣ KEEP_ALL
‣ Theoretically, the only way to assure that an application will see all the samples
  produced by a writer is to use RELIABLE+KEEP_ALL. Any other combination could
  induce to samples being discarded on the receiving side because of the HISTORY depth


                                       © 2009, PrismTech. All Rights Reserved
Real-Time
The real-time properties with which data is delivered to applications is impacted in DDS by the following
qualities of service:
‣ TRANSPORT_PRIORITY                  Publisher
                                                            Deadline             Deadline   Deadline   Deadline   Deadline
                                                                                                                             Subscriber


‣ LATENCY_BUDGET
                                                                       Deadline Violation

‣ In addition, DDS provides means for detecting performance failure, e.g., Deadline miss, by means of
  the DEADLINE QoS
‣ Given a periodic task-set {T} with periods Di (with Di < Di+1) and deadline equal to the period, than
  QoS should be set as follows:
 ‣ Assign to each task Ti a TRANSPORT_PRIORITY Pi such that Pi > Pi+1
 ‣ Set for each task Ti a DEADLINE QoS of Di
 ‣ For maximizing throughput and minimizing resource usage set for each Ti a LATENCY_BUDGET
   QoS between Di /2 and Di/3 (this is a rule of thumb, the upper bound is Di-(RTT/2))

                                              © 2009, PrismTech. All Rights Reserved
High Availability
‣ A Topic can have Shared or Exclusive Ownership
‣ Exclusively owned Topics can be modified by a single writer
‣ Writer strength is used to coordinate replicated writers




                                                                                                                                             Proprietary Information - Distribution without Expressed Written Permission is Prohibited.
                                                              StockQuote
                                                        symbol: "MSFT"
                                                                     StockQuote
                                                                     StockQuote
                                                        name: "Microsoft Corp."
                                                                     StockQuote
                                                                 symbol: "GOOG"
                                                                 symbol: "GOOG"
                                                        exchange: "NASD""GOOG"
                                                                 symbol:
                                                                 name: "Google Inc."
                                                        quote: 33.73
                                                                 name: "Google Inc."
                                                               name: "Google Inc."
                                                               exchange: "NASD"
                                                               exchange: "NASD"
                                                               exchange: "NASD"
                                                                        StockQuote
                                                                        StockQuote
                                                                        StockQuote
                                                               quote: 663.97


                         W1
                                                               quote: 663.97"AAPL"
                                                                    symbol: "AAPL"
                                                               quote: 663.97
                                                                    symbol: "AAPL"
                                                                    symbol:
                                                                     name: "Apple Inc."
                                                                     name: "Apple Inc."
                                                                     name: "Apple Inc."
                                                                     exchange: "NASD"
                                                                     exchange: "NASD"
                                                                     exchange: "NASD"



                                                                                                                                   R1
                                                                     quote: 165.37
                                                                     quote: 165.37
                                                                     quote: 165.37




                   STRENGTH=3

                                            StockQuote
                                         symbol: "AAPL"
                                      StockQuote Inc."
                                         name: "Apple
                                  symbol: "GOOG""NASD"
                                         exchange:
                                  name: quote: 165.37
                                         "Google Inc."
                              StockQuote "NASD"
                                  exchange:
                         symbol: "MSFT"
                                  quote: 663.97
                         name: "Microsoft Corp."
                         exchange: "NASD"
                         quote: 33.73




                W1’                                                                                                                     R2
            STRENGTH=2                                  StockQuote
                                                     symbol: "AAPL"
                                                  StockQuote Inc."
                                                     name: "Apple
                                              symbol: "GOOG""NASD"
                                                     exchange:
                                              name: quote: 165.37
                                                     "Google Inc."
                                          StockQuote "NASD"
                                              exchange:
                                     symbol: "MSFT"
                                              quote: 663.97
                                     name: "Microsoft Corp."
                                     exchange: "NASD"
                                     quote: 33.73




                   W2’’                                                                                                            R3

               STRENGTH=1



                                                                                          © 2009, PrismTech. All Rights Reserved
High Availability
‣ A Topic can have Shared or Exclusive Ownership
‣ Exclusively owned Topics can be modified by a single writer
‣ Writer strength is used to coordinate replicated writers




                                                                                                                                                                           Proprietary Information - Distribution without Expressed Written Permission is Prohibited.
                                                           StockQuote
                                                     symbol: "MSFT"
                                                                  StockQuote
                                                                  StockQuote
                                                     name: "Microsoft Corp."
                                                                  StockQuote
                                                              symbol: "GOOG"
                                                              symbol: "GOOG"
                                                     exchange: "NASD""GOOG"
                                                              symbol:
                                                              name: "Google Inc."
                                                     quote: 33.73
                                                              name: "Google Inc."
                                                            name: "Google Inc."
                                                            exchange: "NASD"
                                                            exchange: "NASD"
                                                            exchange: "NASD"
                                                            quote: 663.97


                         W1
                                                            quote: 663.97
                                                            quote: 663.97




                                                                                                                                 StockQuote
                                                                                                                             symbol: "AAPL"
                                                                                                                                                                 R1
                   STRENGTH=3                                                                                                name: "Apple Inc."
                                                                                                                             exchange: "NASD"
                                                                                                                             quote: 165.37




                                  StockQuote
                               symbol: "GOOG"
                               name: "Google Inc."
                               StockQuote "NASD"
                                  exchange:
                         symbol: "MSFT"
                                  quote: 663.97
                         name: "Microsoft Corp."
                         exchange: "NASD"
                         quote: 33.73




                W1’                                                                                                                                                   R2
                                                                                                                                                StockQuote
                                                                                                                                            symbol: "AAPL"
                                                                                                                                            name: "Apple Inc."
                                                                                                                                            exchange: "NASD"

            STRENGTH=2
                                                                                                                                            quote: 165.37


                                            StockQuote
                                         symbol: "GOOG"
                                         name: "Google Inc."
                                        StockQuote "NASD"
                                           exchange:
                                  symbol: "MSFT"
                                           quote: 663.97
                                  name: "Microsoft Corp."
                                  exchange: "NASD"
                                  quote: 33.73




                   W2’’
                                                                                                                                     StockQuote
                                                                                                                                 symbol: "AAPL"
                                                                                                                                 name: "Apple Inc."
                                                                                                                                 exchange: "NASD"
                                                                                                                                 quote: 165.37
                                                                                                                                                                 R3

               STRENGTH=1



                                                                                    © 2009, PrismTech. All Rights Reserved
High Availability
‣ A Topic can have Shared or Exclusive Ownership
‣ Exclusively owned Topics can be modified by a single writer
‣ Writer strength is used to coordinate replicated writers




                                                                                                                                                                                 Proprietary Information - Distribution without Expressed Written Permission is Prohibited.
                                                              StockQuote
                                                        symbol: "MSFT"
                                                        name: "Microsoft Corp."
                                                        exchange: "NASD"
                                                        quote: 33.73




                         W1
                                                                                                                                       StockQuote
                                                                                                                                   symbol: "AAPL"
                                                                                                                                                                       R1
                   STRENGTH=3                                                                                                      name: "Apple Inc."
                                                                                                                                   exchange: "NASD"
                                                                                                                                   quote: 165.37
                                                                                                                                StockQuote
                                                                                                                            symbol: "GOOG"
                                                                                                                            name: "Google Inc."
                                                                                                                            exchange: "NASD"
                                                                                                                            quote: 663.97



                               StockQuote
                         symbol: "MSFT"
                         name: "Microsoft Corp."
                         exchange: "NASD"
                         quote: 33.73
                                                                                                                                                  StockQuote


                W1’                                                                                                                                                         R2
                                                                                                                                              symbol: "GOOG"
                                                                                                                                              name: "Google Inc."
                                                                                                                                              exchange: "NASD"
                                                                                                                                              quote: 663.97
                                                                                                                                                      StockQuote
                                                                                                                                                  symbol: "AAPL"
                                                                                                                                                  name: "Apple Inc."
                                                                                                                                                  exchange: "NASD"

            STRENGTH=2
                                                                                                                                                  quote: 165.37




                                           StockQuote
                                     symbol: "MSFT"
                                     name: "Microsoft Corp."
                                     exchange: "NASD"                                                                          StockQuote
                                     quote: 33.73                                                                          symbol: "GOOG"



                                                                                                                                                                       R3
                                                                                                                           name: "Google Inc."



                   W2’’
                                                                                                                           exchange: "NASD"StockQuote
                                                                                                                           quote: 663.97symbol: "AAPL"
                                                                                                                                       name: "Apple Inc."
                                                                                                                                       exchange: "NASD"
                                                                                                                                       quote: 165.37




               STRENGTH=1



                                                                                  © 2009, PrismTech. All Rights Reserved
High Availability
‣ A Topic can have Shared or Exclusive Ownership
‣ Exclusively owned Topics can be modified by a single writer
‣ Writer strength is used to coordinate replicated writers




                                                                                                                                            Proprietary Information - Distribution without Expressed Written Permission is Prohibited.
                                                                                                         StockQuote



                                                                                                                                  R1
                                                                                                     symbol: "AAPL"
                                                                                                     name: "Apple Inc."
                                                                                                     exchange: "NASD"
                                                                                                     quote: 165.37




                                                                                                  StockQuote
                                                                                              symbol: "GOOG"
                                                                                              name: "Google Inc."
                                                                                              exchange: "NASD"
                                                                                              quote: 663.97




                                                                                                   StockQuote
                                                                                               symbol: "GOOG"
                                                                                               name: "Google Inc."
                                                                                               exchange: "NASD"
                                                                                               quote: 663.97


                                                                                                                 StockQuote
                                                                                                             symbol: "AAPL"
                                                                                                             name: "Apple Inc."
                                                                                                             exchange: "NASD"
                                                                                                                                       R2
                                                                                                             quote: 165.37




                                 StockQuote
                                 StockQuote
                                 StockQuote                                                       StockQuote
                           symbol: "MSFT"
                           symbol: "MSFT"
                           symbol: "MSFT"                                                     symbol: "GOOG"
                           name: "Microsoft Corp."
                           name: "Microsoft Corp."
                           name: "Microsoft Corp."
                           exchange: "NASD"
                           exchange: "NASD"                                                   name: "Google Inc."
                           exchange: "NASD"
                           quote: 33.73
                           quote: 33.73
                           quote: 33.73                                                       exchange: "NASD"
                                                                                              quote: 663.97


                                                                                                      StockQuote



                                                                                                                                  R3
                                                                                                  symbol: "AAPL"



                  W2’’
                                                                                                  name: "Apple Inc."
                                                                                                  exchange: "NASD"
                                                                                                  quote: 165.37




              STRENGTH=1



                                                     © 2009, PrismTech. All Rights Reserved
High Availability
‣ A Topic can have Shared or Exclusive Ownership
‣ Exclusively owned Topics can be modified by a single writer
‣ Writer strength is used to coordinate replicated writers




                                                                                                                                                          Proprietary Information - Distribution without Expressed Written Permission is Prohibited.
                                                                                                                       StockQuote



                                                                                                                                                R1
                                                                                                                   symbol: "AAPL"
                                                                                                                   name: "Apple Inc."
                                                                                                                   exchange: "NASD"
                                                                                       StockQuote                  quote: 165.37
                                                                                 symbol: "MSFT"
                                                                                 name: "Microsoft Corp."
                                                                                 exchange: "NASD"
                                                                                 quote: 33.73
                                                                                                               StockQuote
                                                                                                           symbol: "GOOG"
                                                                                                           name: "Google Inc."
                                                                                                           exchange: "NASD"
                                                                                                           quote: 663.97




                                                                                                                StockQuote
                                                                                                            symbol: "GOOG"
                                                                                                            name: "Google Inc."
                                                                                                            exchange: "NASD"
                                                                                                            quote: 663.97
                                                                                                   StockQuote



                                                                                                                                                     R2
                                                                                             symbol: "MSFT"
                                                                                             name: "Microsoft Corp."
                                                                                                                               StockQuote
                                                                                             exchange: "NASD"
                                                                                             quote: 33.73
                                                                                                                           symbol: "AAPL"
                                                                                                                           name: "Apple Inc."
                                                                                                                           exchange: "NASD"
                                                                                                                           quote: 165.37




                                                                                                               StockQuote
                                                                                                           symbol: "GOOG"
                                                                                                           name: "Google Inc."
                                                                                       StockQuote          exchange: "NASD"
                                                                                 symbol: "MSFT"            quote: 663.97
                                                                                 name: "Microsoft Corp."
                                                                                 exchange: "NASD"
                                                                                 quote: 33.73
                                                                                                                    StockQuote



                                                                                                                                                R3
                                                                                                                symbol: "AAPL"



                  W2’’
                                                                                                                name: "Apple Inc."
                                                                                                                exchange: "NASD"
                                                                                                                quote: 165.37




              STRENGTH=1



                                        © 2009, PrismTech. All Rights Reserved
Eventual Consistency & R/W Caches
                   DataReader

   DataReader           1   1

                        2   1                                                      DataWriter
      1   1
                        3   1




                                                                                                     Proprietary Information - Distribution without Expressed Written Permission is Prohibited.
      2   1                                                                            1   2
                     Topic
                DataReader                             1     2                         2   3
      3   1
                DataReader Cache                       2     2       2     3           3   1
      Topic
                    1   1
DataReader Cache 2                                                                     Topic
                        1
                                                                 DDS              DataWriter Cache
                    3   1

                    Topic
              DataReader Cache

                 Under an Eventual Consistency Model, DDS guarantees that all matched
                 Reader Caches will eventually be identical of the respective Writer Cache
                                         © 2009, PrismTech. All Rights Reserved
QoS Impacting the Consistency Model
The DDS Consistency Model is a property that can be associated to Topics or further refined by
Reader/Writers. The property is controlled by the following QoS Policies:
‣ DURABILITY
 ‣ VOLATILE | TRANSIENT_LOCAL | TRANSIENT | PERSISTENT
‣ LIFESPAN




                                                                                                                         Proprietary Information - Distribution without Expressed Written Permission is Prohibited.
‣ RELIABILITY
 ‣ RELIABLE | BEST_EFFORT
‣ DESTINATION ORDER
 ‣ SOURCE_TIMESTAMP | DESTINATION_TIMESTAMP
                                                        QoS Policy                     Applicability   RxO   Modifiable
                                                        DURABILITY                      T, DR, DW       Y       N
                                                        LIFESPAN                          T, DW         -       Y
                                                        RELIABILITY                     T, DR, DW       Y       N
                                                        DESTINATION ORDER               T, DR, DW       Y       N


                                              © 2009, PrismTech. All Rights Reserved
QoS Impacting the Consistency Model

                           DURABILITY           RELIABILITY                           DESTINATION_ORDER      LIFESPAN
Eventual Consistency         VOLATILE               RELIABLE                          SOURCE_TIMESTAMP         INF.
(No Crash / Recovery)
Eventual Consistency      TRANSIENT_LOCAL           RELIABLE                          SOURCE_TIMESTAMP         INF.




                                                                                                                        Proprietary Information - Distribution without Expressed Written Permission is Prohibited.
(Reader Crash / Recovery)
Eventual Consistency        TRANSIENT               RELIABLE                          SOURCE_TIMESTAMP         INF.
(Crash/Recovery)
Eventual Consistency       PERSISTENT               RELIABLE                          SOURCE_TIMESTAMP         INF.
(Crash/Recovery)
Weak Consistency               ANY                        ANY                        DESTINATION_TIMESTAMP     ANY
Weak Consistency               ANY             BEST_EFFORT                                   ANY               ANY
Weak Consistency               ANY                        ANY                                ANY                N



                                            © 2009, PrismTech. All Rights Reserved
Eventual Consistency @ Work
                                      DURABILITY       RELIABILITY DESTINATION_ORDER                              LIFESPAN
Eventual Consistency (Reader        TRANSIENT_LOCAL       RELIABLE                SOURCE_TIMESTAMP                    INF.
Crash / Recovery)
                                                                                                                             {A}
Eventual Consistency                   TRANSIENT          RELIABLE                SOURCE_TIMESTAMP                    INF.
                                                                                                                             {B}
(Crash/Recovery)
Weak Consistency                         ANY                  ANY                                  ANY                 N     {J}




                                                                                                                                   Proprietary Information - Distribution without Expressed Written Permission is Prohibited.
                                                                                                              S = {A, D}

                                                                                                                 S1
                  P = {A, B}                   B


                     P1                                   m

                                               A                           F


                                               J
                                                                   D                           C
                    P = {D, C, J}

                       P2                      K
                                                                   E



                                                                                                    S = {A}

                                                                                                      S4
                                                      © 2009, PrismTech. All Rights Reserved
Eventual Consistency @ Work
                                      DURABILITY       RELIABILITY DESTINATION_ORDER                              LIFESPAN
Eventual Consistency (Reader        TRANSIENT_LOCAL       RELIABLE                SOURCE_TIMESTAMP                    INF.
Crash / Recovery)
                                                                                                                             {A}
Eventual Consistency                   TRANSIENT          RELIABLE                SOURCE_TIMESTAMP                    INF.
                                                                                                                             {B}
(Crash/Recovery)
Weak Consistency                         ANY                  ANY                                  ANY                 N     {J}




                                                                                                                                   Proprietary Information - Distribution without Expressed Written Permission is Prohibited.
                                                                                                              S = {A, D}

                                                                                                                 S1
                  P = {A, B}                   B


                     P1                                   m

                          A                    A                           F


                                               J
                                                                   D                           C
                    P = {D, C, J}

                       P2                      K
                                                                   E



                                                                                                    S = {A}

                                                                                                      S4
                                                      © 2009, PrismTech. All Rights Reserved
Eventual Consistency @ Work
                                      DURABILITY       RELIABILITY DESTINATION_ORDER                              LIFESPAN
Eventual Consistency (Reader        TRANSIENT_LOCAL       RELIABLE                SOURCE_TIMESTAMP                    INF.
Crash / Recovery)
                                                                                                                             {A}
Eventual Consistency                   TRANSIENT          RELIABLE                SOURCE_TIMESTAMP                    INF.
                                                                                                                             {B}
(Crash/Recovery)
Weak Consistency                         ANY                  ANY                                  ANY                  N    {J}




                                                                                                                                   Proprietary Information - Distribution without Expressed Written Permission is Prohibited.
                                                                                                              S = {A, D}

                                                                                                                 S1
                  P = {A, B}                   B
                                                                                                                    A
                     P1                                   m

                                               A
                                               A                           F


                                               J
                                                                   D                           C
                    P = {D, C, J}

                       P2                      K
                                                                   E



                                                                                                    S = {A}

                                                                                                      S4
                                                      © 2009, PrismTech. All Rights Reserved        A
Eventual Consistency @ Work
                                      DURABILITY       RELIABILITY DESTINATION_ORDER                              LIFESPAN
Eventual Consistency (Reader        TRANSIENT_LOCAL       RELIABLE                SOURCE_TIMESTAMP                    INF.
Crash / Recovery)
                                                                                                                             {A}
Eventual Consistency                   TRANSIENT          RELIABLE                SOURCE_TIMESTAMP                    INF.
                                                                                                                             {B}
(Crash/Recovery)
Weak Consistency                         ANY                  ANY                                  ANY                  N    {J}




                                                                                                                                   Proprietary Information - Distribution without Expressed Written Permission is Prohibited.
                                                                                                              S = {A, D}

                                                                                                                 S1
                  P = {A, B}                   B
                                                                                                                    A
                     P1                                   m

                        B                      A
                                               A                           F


                                               J
                                                                   D                           C
                    P = {D, C, J}

                       P2                      K
                                                                   E



                                                                                                    S = {A}

                                                                                                      S4
                                                      © 2009, PrismTech. All Rights Reserved        A
Eventual Consistency @ Work
                                      DURABILITY       RELIABILITY DESTINATION_ORDER                              LIFESPAN
Eventual Consistency (Reader        TRANSIENT_LOCAL       RELIABLE                SOURCE_TIMESTAMP                    INF.
Crash / Recovery)
                                                                                                                             {A}
Eventual Consistency                   TRANSIENT          RELIABLE                SOURCE_TIMESTAMP                    INF.
                                                                                                                             {B}
(Crash/Recovery)
Weak Consistency                         ANY                  ANY                                  ANY                  N    {J}




                                                                                                                                   Proprietary Information - Distribution without Expressed Written Permission is Prohibited.
                                                                                                              S = {A, D}

                                                                                                                 S1
                  P = {A, B}                   B
                                               B
                                                                                                                    A
                     P1                                   m

                                               A
                                               A                           F


                                               J
                                                                   D                           C
                    P = {D, C, J}

                       P2                      K
                                                                   E



                                                                                                    S = {A}

                                                                                                      S4
                                                      © 2009, PrismTech. All Rights Reserved        A
Eventual Consistency @ Work
                                      DURABILITY       RELIABILITY DESTINATION_ORDER                              LIFESPAN
Eventual Consistency (Reader        TRANSIENT_LOCAL       RELIABLE                SOURCE_TIMESTAMP                    INF.
Crash / Recovery)
                                                                                                                               {A}
Eventual Consistency                   TRANSIENT          RELIABLE                SOURCE_TIMESTAMP                    INF.
                                                                                                                               {B}
(Crash/Recovery)
Weak Consistency                         ANY                  ANY                                  ANY                  N      {J}




                                                                                                                                     Proprietary Information - Distribution without Expressed Written Permission is Prohibited.
                                                                                                              S = {A, D}

                                                                                                                 S1
                  P = {A, B}                   B
                                               B
                                                                                                                    A
                     P1                                   m
                                                                                                                S= {A, B, J}
                                               A
                                               A                           F

                                                                                                                    S2
                                               J
                                                                   D                           C
                    P = {D, C, J}

                       P2                      K
                                                                   E



                                                                                                    S = {A}

                                                                                                      S4
                                                      © 2009, PrismTech. All Rights Reserved        A
Eventual Consistency @ Work
                                      DURABILITY       RELIABILITY DESTINATION_ORDER                              LIFESPAN
Eventual Consistency (Reader        TRANSIENT_LOCAL       RELIABLE                SOURCE_TIMESTAMP                    INF.
Crash / Recovery)
                                                                                                                               {A}
Eventual Consistency                   TRANSIENT          RELIABLE                SOURCE_TIMESTAMP                    INF.
                                                                                                                               {B}
(Crash/Recovery)
Weak Consistency                         ANY                  ANY                                  ANY                  N      {J}




                                                                                                                                     Proprietary Information - Distribution without Expressed Written Permission is Prohibited.
                                                                                                              S = {A, D}

                                                                                                                 S1
                  P = {A, B}                   B
                                               B
                                                                                                                    A
                     P1                                   m
                                                                                                                S= {A, B, J}
                                               A
                                               A                           F

                                                                                                                    S2
                                               J
                                                                   D                           C                    BA
                    P = {D, C, J}

                       P2                      K
                                                                   E



                                                                                                    S = {A}

                                                                                                      S4
                                                      © 2009, PrismTech. All Rights Reserved        A
Eventual Consistency @ Work
                                      DURABILITY       RELIABILITY DESTINATION_ORDER                              LIFESPAN
Eventual Consistency (Reader        TRANSIENT_LOCAL       RELIABLE                SOURCE_TIMESTAMP                      INF.
Crash / Recovery)
                                                                                                                                 {A}
Eventual Consistency                   TRANSIENT          RELIABLE                SOURCE_TIMESTAMP                      INF.
                                                                                                                                 {B}
(Crash/Recovery)
Weak Consistency                         ANY                  ANY                                  ANY                     N     {J}




                                                                                                                                       Proprietary Information - Distribution without Expressed Written Permission is Prohibited.
                                                                                                              S = {A, D}

                                                                                                                  S1
                                               B
                                               B
                                                                                                                       A
                                                          m
                                                                                                                  S= {A, B, J}
                                               A                           F

                                                                                                                       S2
                                               J
                                                                   D                           C                       BA
                    P = {D, C, J}

                       P2                      K
                                                                    E


                                                                                                    S = {A}

                                                                                                      S4
                                                      © 2009, PrismTech. All Rights Reserved         A
Eventual Consistency @ Work
                                      DURABILITY       RELIABILITY DESTINATION_ORDER                                  LIFESPAN
Eventual Consistency (Reader        TRANSIENT_LOCAL       RELIABLE                SOURCE_TIMESTAMP                          INF.
Crash / Recovery)
                                                                                                                                     {A}
Eventual Consistency                   TRANSIENT          RELIABLE                SOURCE_TIMESTAMP                          INF.
                                                                                                                                     {B}
(Crash/Recovery)
Weak Consistency                         ANY                  ANY                                  ANY                         N     {J}




                                                                                                                                           Proprietary Information - Distribution without Expressed Written Permission is Prohibited.
                                                                                                                 S = {A, D}

                                                                                                                      S1
                                               B
                                               B
                                                                                                                           A
                                                          m
                                                                                                                      S= {A, B, J}
                                               A                           F

                                                                                                                           S2
                                               J
                                                                   D                           C                           BA
                    P = {D, C, J}                                                                             S= {A, B, D, J}

                       P2                      K
                                                                    E                                               S3

                                                                                                    S = {A}

                                                                                                      S4
                                                      © 2009, PrismTech. All Rights Reserved         A
Eventual Consistency @ Work
                                      DURABILITY       RELIABILITY DESTINATION_ORDER                                  LIFESPAN
Eventual Consistency (Reader        TRANSIENT_LOCAL       RELIABLE                SOURCE_TIMESTAMP                          INF.
Crash / Recovery)
                                                                                                                                     {A}
Eventual Consistency                   TRANSIENT          RELIABLE                SOURCE_TIMESTAMP                          INF.
                                                                                                                                     {B}
(Crash/Recovery)
Weak Consistency                         ANY                  ANY                                  ANY                          N    {J}




                                                                                                                                           Proprietary Information - Distribution without Expressed Written Permission is Prohibited.
                                                                                                                 S = {A, D}

                                                                                                                      S1
                                               B
                                               B
                                                                                                                            A
                                                          m
                                                                                                                      S= {A, B, J}
                                               A                           F

                                                                                                                           S2
                                               J
                                               J
                                                                   D
                                                                   D                           C                            BA
                    P = {D, C, J}                                                                             S= {A, B, D, J}

                       P2                      K
                                                                    E                                               S3

                                                                                                    S = {A}            JB


                                                                                                      S4
                                                      © 2009, PrismTech. All Rights Reserved         A
A Gentle Introduction to OpenSplice DDS
A Gentle Introduction to OpenSplice DDS
A Gentle Introduction to OpenSplice DDS
A Gentle Introduction to OpenSplice DDS
A Gentle Introduction to OpenSplice DDS
A Gentle Introduction to OpenSplice DDS
A Gentle Introduction to OpenSplice DDS
A Gentle Introduction to OpenSplice DDS
A Gentle Introduction to OpenSplice DDS
A Gentle Introduction to OpenSplice DDS
A Gentle Introduction to OpenSplice DDS
A Gentle Introduction to OpenSplice DDS
A Gentle Introduction to OpenSplice DDS
A Gentle Introduction to OpenSplice DDS
A Gentle Introduction to OpenSplice DDS
A Gentle Introduction to OpenSplice DDS
A Gentle Introduction to OpenSplice DDS
A Gentle Introduction to OpenSplice DDS
A Gentle Introduction to OpenSplice DDS
A Gentle Introduction to OpenSplice DDS
A Gentle Introduction to OpenSplice DDS
A Gentle Introduction to OpenSplice DDS
A Gentle Introduction to OpenSplice DDS
A Gentle Introduction to OpenSplice DDS
A Gentle Introduction to OpenSplice DDS
A Gentle Introduction to OpenSplice DDS
A Gentle Introduction to OpenSplice DDS
A Gentle Introduction to OpenSplice DDS
A Gentle Introduction to OpenSplice DDS
A Gentle Introduction to OpenSplice DDS
A Gentle Introduction to OpenSplice DDS
A Gentle Introduction to OpenSplice DDS
A Gentle Introduction to OpenSplice DDS
A Gentle Introduction to OpenSplice DDS
A Gentle Introduction to OpenSplice DDS
A Gentle Introduction to OpenSplice DDS
A Gentle Introduction to OpenSplice DDS
A Gentle Introduction to OpenSplice DDS
A Gentle Introduction to OpenSplice DDS
A Gentle Introduction to OpenSplice DDS
A Gentle Introduction to OpenSplice DDS
A Gentle Introduction to OpenSplice DDS
A Gentle Introduction to OpenSplice DDS
A Gentle Introduction to OpenSplice DDS
A Gentle Introduction to OpenSplice DDS
A Gentle Introduction to OpenSplice DDS
A Gentle Introduction to OpenSplice DDS
A Gentle Introduction to OpenSplice DDS

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A Gentle Introduction to OpenSplice DDS

  • 1. OpenSplice DDS Delivering Performance, Openness, and Freedom Angelo Corsaro, Ph.D. Chief Technology Officer A Gentle Introduction OMG DDS SIG Co-Chair angelo.corsaro@prismtech.com
  • 2. OpenSplice DDS Delivering Performance, Openness, and Freedom “Historical” Perspective
  • 3. Addressing Data Distribution Challenges DDS is standard designed to address the data-distribution challenges across The OMG DDS Standard a wide class of Defense and Aerospace Applications ‣ Introduced in 2004 to address the Data Distribution challenges faced by a wide class of Defense and Aerospace Applications ‣ Key requirement for the standard were its ability to deliver very high performance while seamlessly scaling from embedded to ultra- large-scale deployments ‣ Today recommended by key administration worldwide and widely adopted across several different application domains, such as, Automated Trading, Simulations, SCADA, Telemetry, etc. © 2009, PrismTech. All Rights Reserved
  • 4. The OMG Data Distribution Service (DDS) DDS v1.2 API Standard ‣ Language Independent, OS and HW architecture Application independent Object/Relational Mapping ‣ DCPS. Standard API for Data-Centric, Topic- Data Local Reconstruction Layer (DLRL) Based, Real-Time Publish/Subscribe Content ‣ Ownership Durability DLRL. Standard API for creating Object Views out Subscription of collection of Topics Minimum Profile Data Centric Publish/Subscribe (DCPS) DDSI/RTPS v2.1 Wire Protocol Standard ‣ Standard wire protocol allowing interoperability Real-Time Publish/Subscribe Protocol DDS Interoperability Wire Protocol between different implementations of the DDS standard UDP/IP ‣ Interoperability demonstrated among key DDS vendors in March 2009 © 2009, PrismTech. All Rights Reserved
  • 5. DDS!Recommendations is churning… The infrastructure evolution cycle – New -> Emerging -> Standard -> Commodity Increasingly Mandated/Recommended by Administrations – Middleware is emerging as OS declines ! …DDS is maturing… ‣ US Navy: Open Architecture – OMG focus – Wire spec Proprietary Information - Distribution without Expressed Written Permission is Prohibited. ‣ DISR/DISA: Net-centric Systems – Tools – Enterprise integration – Multiple products fielded ‣ EuroControl:– Deployed applications! Air Traffic Control Center Operational Interoperability ! …and adoption is on the rise – Navy – DISR ‣ QinetiQ: Recommending DDS for VSI – FCS/SoSCOE © 2009, PrismTech. All Rights Reserved
  • 6. OpenSplice DDS Delivering Performance, Openness, and Freedom As Simple as it Gets
  • 7. As Simple as it Gets ‣ DDS is based around the concept of a fully distributed Global Data Space (GDS) Global Data Space DDS © 2009, PrismTech. All Rights Reserved
  • 8. As Simple as it Gets ‣ DDS is based around the concept of a fully distributed Global Data Space (GDS) ‣ Publishers and Subscribers can join and leave the GDS at any time Global Data Space DDS © 2009, PrismTech. All Rights Reserved
  • 9. As Simple as it Gets ‣ DDS is based around the concept of a fully distributed Global Data Publisher Subscriber Space (GDS) ‣ Publishers and Subscribers can join and leave the GDS at any time Subscriber Publisher Global Data Space Publisher Subscriber DDS © 2009, PrismTech. All Rights Reserved
  • 10. As Simple as it Gets ‣ DDS is based around the concept of a fully distributed Global Data Publisher Subscriber Space (GDS) ‣ Publishers and Subscribers can join and leave the GDS at any time Subscriber ‣ Publishers and Subscribers Publisher Global Data Space express their intent to produce/ consume specific type of data, e.g., Topics Publisher Subscriber DDS © 2009, PrismTech. All Rights Reserved
  • 11. As Simple as it Gets ‣ DDS is based around the concept of a fully distributed Global Data Publisher Subscriber Space (GDS) ‣ Publishers and Subscribers can join and leave the GDS at any time Subscriber ‣ Publishers and Subscribers Publisher Global Data Space express their intent to produce/ consume specific type of data, e.g., Topics Publisher Subscriber DDS © 2009, PrismTech. All Rights Reserved
  • 12. As Simple as it Gets ‣ DDS is based around the concept of a fully distributed Global Data Publisher Subscriber Space (GDS) ‣ Publishers and Subscribers can join and leave the GDS at any time Subscriber ‣ Publishers and Subscribers Publisher Global Data Space express their intent to produce/ consume specific type of data, e.g., Topics Subscriber ‣ Data flows from Publisher to Publisher Subscribers DDS © 2009, PrismTech. All Rights Reserved
  • 13. As Simple as it Gets ‣ DDS is based around the concept of a fully distributed Global Data Publisher Subscriber Space (GDS) ‣ Publishers and Subscribers can join and leave the GDS at any time Subscriber ‣ Publishers and Subscribers Publisher Global Data Space express their intent to produce/ consume specific type of data, e.g., Topics Subscriber ‣ Data flows from Publisher to Publisher Subscribers DDS © 2009, PrismTech. All Rights Reserved
  • 14. OpenSplice DDS Delivering Performance, Openness, and Freedom Defining Data
  • 15. DDS Topics {Circle, Square, Triangle} Topic ‣ Unit of information exchanged between Publisher and Subscribers. ‣ An association between a unique name, a type and a QoS setting {ShapeType} {...} Topic Type. struct ShapeType { ‣ Type describing the data associated with one long x; or more Topics long y; ‣ A Topic type can have a key represented by an long shapesize; string color; arbitrary number of attributes }; ‣ Expressed in IDL #pragma keylist ShapeType color © 2009, PrismTech. All Rights Reserved
  • 16. DDS Topics Circle struct ShapeType { long x; long y; long shapesize; Topic QoS string color; }; #pragma keylist ShapeType color © 2009, PrismTech. All Rights Reserved
  • 17. DDS Topics Triangle struct ShapeType { long x; long y; long shapesize; Topic QoS string color; }; #pragma keylist ShapeType color © 2009, PrismTech. All Rights Reserved
  • 18. DDS Topic Instances and Samples Topic Instances ‣ Each key value identifies a unique Topic Instance, ‣ Topic’s instance lifetime can be explicitly managed in DDS Topic Samples ‣ The values assumed by a Topic Instance over time are referred as Instance Sample struct ShapeType { long x; long y; long shapesize; string color; }; #pragma keylist ShapeType color © 2009, PrismTech. All Rights Reserved
  • 19. Topic/Instances/Samples Recap. Topics Instances Samples ti tj tnow time © 2009, PrismTech. All Rights Reserved
  • 20. Content Filtering X0 X1 X0 <= X <= X1 ‣ DDS allows to specify content- filtered Topics for which a subset of SQL92 is used to express the filter condition Y0 ‣ Content filters can be applied on the entire content of the Topic Type Y0 <= Y <= Y1 ‣ Content filters are applied by DDS Y1 each time a new sample is produced/delivered © 2009, PrismTech. All Rights Reserved
  • 21. Filtering Market Data AAPL < $157 | | AAPL > $162 MSFT > $35 Apple 164.0 Microsoft 40 161.5 30 159.0 20 156.5 10 154.0 0 AAPL MSFT ‣ DDS continuous queries can be used for filtering the stream of data produced for a specific stock symbol. © 2009, PrismTech. All Rights Reserved
  • 22. Local Queries ‣ Subscribed Topics can be seen locally as “Tables” ‣ A subset of SQL92 can be used for performing queries on X0 multiple topics as well as natural joins ‣ Queries are Circle Topic performed under Y0 color x y shapesize Y0 user control and red 57 62 50 provide a result that blue 90 85 50 Y0 <= Y <= Y1 depends on the yellow 30 25 50 current snapshot of SELECT * FROM ShapeType s WHERE s.x > 25 AND s.y < 55 Y1 the system, e.g., samples currently color x y shapesize available yellow 30 25 50 © 2009, PrismTech. All Rights Reserved
  • 23. OpenSplice DDS Delivering Performance, Openness, and Freedom Organizing Data
  • 24. DDS Partitions ‣ All DDS communication is Domain Partition happens within a Domain ‣ Domain can divided into Publisher Subscriber Partitions B ‣ Topics are published and m subscribed across on or A F Subscriber more Partitions Publisher J D C K E Publisher Subscriber © 2009, PrismTech. All Rights Reserved
  • 25. OpenSplice Network Partitions ‣ OpenSplice DDS allows to Publisher Subscriber define network partitions along "Red" B with DDS partitions m ‣ Network partitions are bound to A F a list of unicast/multicast Publisher J "Green" Subscriber network addresses D C ‣ Partition.Topic combination can K E "Yellow" be mapped into OpenSplice DDS Network Partitions Publisher Subscriber ‣ Wildcards can be used when defining the mapping, and in Yellow.* => 224.1.1.1 Green.* => 224.1.1.2 case of multiple matches Green.E => 224.1.1.3 OpenSplice DDS will always consider the best match © 2009, PrismTech. All Rights Reserved
  • 26. OpenSplice DDS Delivering Performance, Openness, and Freedom Quality of Service
  • 27. Anatomy of a DDS Application Topic Topic Topic Samples Samples Instances Samples Instances Instances 121 62 1 21 62 1 22 62 1 22 62 1 23 63 1 23 63 DataReader DataReader 1 21 62 2 20 61 1 22 62 2 19 60 1 23 63 DataReader DataReader 2 20 61 2 20 61 2 19 60 2 19 60 DataWriter DataWriter DataReader DataReader 3 25 70 3 25 71 25 3 25 74 3 26 77 3 26 77 DataWriter DataWriter 3 25 70 3 25 71 25 3 25 74 struct TempSensor { 3 25 70 3 25 71 25 3 25 74 3 26 77 int tID; float temp; float humidity; }; #pragma keylist TempSensor tID © 2009, PrismTech. All Rights Reserved
  • 28. Anatomy of a DDS Application Topic Topic Topic Samples Samples Instances Samples Instances Instances 121 62 1 21 62 1 22 62 1 22 62 1 23 63 1 23 63 DataReader DataReader 1 21 62 2 20 61 1 22 62 2 19 60 1 23 63 DataReader DataReader 2 20 61 2 20 61 2 19 60 2 19 60 DataWriter DataWriter DataReader DataReader 3 25 70 3 25 71 25 3 25 74 3 26 77 3 26 77 DataWriter DataWriter 3 25 70 3 25 71 25 3 25 74 struct TempSensor { 3 25 70 3 25 71 25 3 25 74 3 26 77 int tID; float temp; Arrows }; float humidity; show #pragma keylist TempSensor tID structural relationship s, not data- Subscriber Publisher flows Partition © 2009, PrismTech. All Rights Reserved
  • 29. Anatomy of a DDS Application Topic Topic Topic Samples Samples Instances Samples Instances Instances 121 62 1 21 62 1 22 62 1 22 62 1 23 63 1 23 63 DataReader DataReader 1 21 62 2 20 61 1 22 62 2 19 60 1 23 63 DataReader DataReader 2 20 61 2 20 61 2 19 60 2 19 60 DataWriter DataWriter DataReader DataReader 3 25 70 3 25 71 25 3 25 74 3 26 77 3 26 77 DataWriter DataWriter 3 25 70 3 25 71 25 3 25 74 struct TempSensor { 3 25 70 3 25 71 25 3 25 74 3 26 77 int tID; float temp; Arrows }; float humidity; show #pragma keylist TempSensor tID structural relationship s, not data- Subscriber Publisher flows Partition Domain Participant Domain © 2009, PrismTech. All Rights Reserved
  • 30. QoS Model ‣ QoS-Policies are used to control relevant properties of OpenSplice DDS entities, Type Matching QoS matching such as: QoS QoS QoS QoS QoS QoS QoS ‣ Temporal Properties ‣ Priority Topic Name Publisher Subscriber ‣ Durability ... DataWriter writes Type reads DataReader ... ... ‣ Availability DomainParticipant writes Type reads DataReader DomainParticipant DataWriter ‣ ... Name ‣ Some QoS-Policies are matched based on Topic QoS QoS QoS a Request vs. Offered Model thus QoS- enforcement ‣ Publications and Subscriptions match only if the declared vs. requested QoS are compatible ‣ e.g., it is not possible to match a publisher which delivers data unreliably with a subscriber which requires reliability © 2009, PrismTech. All Rights Reserved
  • 31. QoS Policies QoS Policy Applicability RxO Modifiable Type Matching QoS matching DURABILITY T, DR, DW Y N Data Availability QoS QoS QoS QoS QoS QoS QoS DURABILITY SERVICE T, DW N N Topic Name Publisher Subscriber LIFESPAN T, DW - Y ... DataWriter writes Type reads DataReader ... T, DR, DW N N ... HISTORY DomainParticipant DataWriter writes Type reads DataReader DomainParticipant PRESENTATION P, S Y N Data Delivery Name Topic RELIABILITY T, DR, DW Y N PARTITION P, S N Y QoS QoS QoS DESTINATION ORDER T, DR, DW Y N OWNERSHIP T, DR, DW Y N ‣ Rich set of QoS allow to configure OWNERSHIP DW - Y STRENGTH several different aspects of data DEADLINE T, DR, DW Y Y Data Timeliness availability, delivery and timeliness LATENCY BUDGET T, DR, DW Y Y TRANSPORT PRIORITY T, DW - Y ‣ QoS can be used to control and optimize network as well as TIME BASED FILTER DR - Y Resources computing resource RESOURCE LIMITS T, DR, DW N N USER_DATA DP, DR, DW N Y Configuration TOPIC_DATA T N Y GROUP_DATA P, S N Y © 2009, PrismTech. All Rights Reserved
  • 32. Mapping QoS Which properties does QoS controls? TimeBasedFilter Deadline Data Throughput Latency LatencyBudget TransportPriority Proprietary Information - Distribution without Expressed Written Permission is Prohibited. Control over Latency/Throughput tradeoff Control over data latency Control over data priority © 2009, PrismTech. All Rights Reserved
  • 33. Mapping QoS Which properties does QoS controls? TimeBasedFilter Deadline History Data Data Throughput Lifespan Durability Latency Availability Ownership LatencyBudget TransportPriority Ownership Strength Proprietary Information - Distribution without Expressed Written Permission is Prohibited. Control over Latency/Throughput tradeoff Control over data queueing Control over data latency Control over data persistency Control over data priority Control over data sources hot-swap © 2009, PrismTech. All Rights Reserved
  • 34. Mapping QoS Which properties does QoS controls? TimeBasedFilter Deadline History Data Data Throughput Lifespan Durability Latency Availability Ownership LatencyBudget TransportPriority Ownership Strength Proprietary Information - Distribution without Expressed Written Permission is Prohibited. Control over Latency/Throughput tradeoff Control over data queueing Control over data latency Control over data persistency Control over data priority Control over data sources hot-swap Reliability OpenSplice DDS provides programmatic Destination QoS-driven support for configuring the most Presentation Data Delivery Order important properties of data distribution! Control over data distribution reliability Control over data ordering Control over presentation © 2009, PrismTech. All Rights Reserved
  • 35. Reliability The reliability with which data is delivered to applications is impacted in DDS by the following qualities of service ‣ RELIABILITY ‣ BEST_EFORT ‣ RELIABLE ‣ HISTORY ‣ KEEP_LAST (K) ‣ KEEP_ALL ‣ Theoretically, the only way to assure that an application will see all the samples produced by a writer is to use RELIABLE+KEEP_ALL. Any other combination could induce to samples being discarded on the receiving side because of the HISTORY depth © 2009, PrismTech. All Rights Reserved
  • 36. Real-Time The real-time properties with which data is delivered to applications is impacted in DDS by the following qualities of service: ‣ TRANSPORT_PRIORITY Publisher Deadline Deadline Deadline Deadline Deadline Subscriber ‣ LATENCY_BUDGET Deadline Violation ‣ In addition, DDS provides means for detecting performance failure, e.g., Deadline miss, by means of the DEADLINE QoS ‣ Given a periodic task-set {T} with periods Di (with Di < Di+1) and deadline equal to the period, than QoS should be set as follows: ‣ Assign to each task Ti a TRANSPORT_PRIORITY Pi such that Pi > Pi+1 ‣ Set for each task Ti a DEADLINE QoS of Di ‣ For maximizing throughput and minimizing resource usage set for each Ti a LATENCY_BUDGET QoS between Di /2 and Di/3 (this is a rule of thumb, the upper bound is Di-(RTT/2)) © 2009, PrismTech. All Rights Reserved
  • 37. High Availability ‣ A Topic can have Shared or Exclusive Ownership ‣ Exclusively owned Topics can be modified by a single writer ‣ Writer strength is used to coordinate replicated writers Proprietary Information - Distribution without Expressed Written Permission is Prohibited. StockQuote symbol: "MSFT" StockQuote StockQuote name: "Microsoft Corp." StockQuote symbol: "GOOG" symbol: "GOOG" exchange: "NASD""GOOG" symbol: name: "Google Inc." quote: 33.73 name: "Google Inc." name: "Google Inc." exchange: "NASD" exchange: "NASD" exchange: "NASD" StockQuote StockQuote StockQuote quote: 663.97 W1 quote: 663.97"AAPL" symbol: "AAPL" quote: 663.97 symbol: "AAPL" symbol: name: "Apple Inc." name: "Apple Inc." name: "Apple Inc." exchange: "NASD" exchange: "NASD" exchange: "NASD" R1 quote: 165.37 quote: 165.37 quote: 165.37 STRENGTH=3 StockQuote symbol: "AAPL" StockQuote Inc." name: "Apple symbol: "GOOG""NASD" exchange: name: quote: 165.37 "Google Inc." StockQuote "NASD" exchange: symbol: "MSFT" quote: 663.97 name: "Microsoft Corp." exchange: "NASD" quote: 33.73 W1’ R2 STRENGTH=2 StockQuote symbol: "AAPL" StockQuote Inc." name: "Apple symbol: "GOOG""NASD" exchange: name: quote: 165.37 "Google Inc." StockQuote "NASD" exchange: symbol: "MSFT" quote: 663.97 name: "Microsoft Corp." exchange: "NASD" quote: 33.73 W2’’ R3 STRENGTH=1 © 2009, PrismTech. All Rights Reserved
  • 38. High Availability ‣ A Topic can have Shared or Exclusive Ownership ‣ Exclusively owned Topics can be modified by a single writer ‣ Writer strength is used to coordinate replicated writers Proprietary Information - Distribution without Expressed Written Permission is Prohibited. StockQuote symbol: "MSFT" StockQuote StockQuote name: "Microsoft Corp." StockQuote symbol: "GOOG" symbol: "GOOG" exchange: "NASD""GOOG" symbol: name: "Google Inc." quote: 33.73 name: "Google Inc." name: "Google Inc." exchange: "NASD" exchange: "NASD" exchange: "NASD" quote: 663.97 W1 quote: 663.97 quote: 663.97 StockQuote symbol: "AAPL" R1 STRENGTH=3 name: "Apple Inc." exchange: "NASD" quote: 165.37 StockQuote symbol: "GOOG" name: "Google Inc." StockQuote "NASD" exchange: symbol: "MSFT" quote: 663.97 name: "Microsoft Corp." exchange: "NASD" quote: 33.73 W1’ R2 StockQuote symbol: "AAPL" name: "Apple Inc." exchange: "NASD" STRENGTH=2 quote: 165.37 StockQuote symbol: "GOOG" name: "Google Inc." StockQuote "NASD" exchange: symbol: "MSFT" quote: 663.97 name: "Microsoft Corp." exchange: "NASD" quote: 33.73 W2’’ StockQuote symbol: "AAPL" name: "Apple Inc." exchange: "NASD" quote: 165.37 R3 STRENGTH=1 © 2009, PrismTech. All Rights Reserved
  • 39. High Availability ‣ A Topic can have Shared or Exclusive Ownership ‣ Exclusively owned Topics can be modified by a single writer ‣ Writer strength is used to coordinate replicated writers Proprietary Information - Distribution without Expressed Written Permission is Prohibited. StockQuote symbol: "MSFT" name: "Microsoft Corp." exchange: "NASD" quote: 33.73 W1 StockQuote symbol: "AAPL" R1 STRENGTH=3 name: "Apple Inc." exchange: "NASD" quote: 165.37 StockQuote symbol: "GOOG" name: "Google Inc." exchange: "NASD" quote: 663.97 StockQuote symbol: "MSFT" name: "Microsoft Corp." exchange: "NASD" quote: 33.73 StockQuote W1’ R2 symbol: "GOOG" name: "Google Inc." exchange: "NASD" quote: 663.97 StockQuote symbol: "AAPL" name: "Apple Inc." exchange: "NASD" STRENGTH=2 quote: 165.37 StockQuote symbol: "MSFT" name: "Microsoft Corp." exchange: "NASD" StockQuote quote: 33.73 symbol: "GOOG" R3 name: "Google Inc." W2’’ exchange: "NASD"StockQuote quote: 663.97symbol: "AAPL" name: "Apple Inc." exchange: "NASD" quote: 165.37 STRENGTH=1 © 2009, PrismTech. All Rights Reserved
  • 40. High Availability ‣ A Topic can have Shared or Exclusive Ownership ‣ Exclusively owned Topics can be modified by a single writer ‣ Writer strength is used to coordinate replicated writers Proprietary Information - Distribution without Expressed Written Permission is Prohibited. StockQuote R1 symbol: "AAPL" name: "Apple Inc." exchange: "NASD" quote: 165.37 StockQuote symbol: "GOOG" name: "Google Inc." exchange: "NASD" quote: 663.97 StockQuote symbol: "GOOG" name: "Google Inc." exchange: "NASD" quote: 663.97 StockQuote symbol: "AAPL" name: "Apple Inc." exchange: "NASD" R2 quote: 165.37 StockQuote StockQuote StockQuote StockQuote symbol: "MSFT" symbol: "MSFT" symbol: "MSFT" symbol: "GOOG" name: "Microsoft Corp." name: "Microsoft Corp." name: "Microsoft Corp." exchange: "NASD" exchange: "NASD" name: "Google Inc." exchange: "NASD" quote: 33.73 quote: 33.73 quote: 33.73 exchange: "NASD" quote: 663.97 StockQuote R3 symbol: "AAPL" W2’’ name: "Apple Inc." exchange: "NASD" quote: 165.37 STRENGTH=1 © 2009, PrismTech. All Rights Reserved
  • 41. High Availability ‣ A Topic can have Shared or Exclusive Ownership ‣ Exclusively owned Topics can be modified by a single writer ‣ Writer strength is used to coordinate replicated writers Proprietary Information - Distribution without Expressed Written Permission is Prohibited. StockQuote R1 symbol: "AAPL" name: "Apple Inc." exchange: "NASD" StockQuote quote: 165.37 symbol: "MSFT" name: "Microsoft Corp." exchange: "NASD" quote: 33.73 StockQuote symbol: "GOOG" name: "Google Inc." exchange: "NASD" quote: 663.97 StockQuote symbol: "GOOG" name: "Google Inc." exchange: "NASD" quote: 663.97 StockQuote R2 symbol: "MSFT" name: "Microsoft Corp." StockQuote exchange: "NASD" quote: 33.73 symbol: "AAPL" name: "Apple Inc." exchange: "NASD" quote: 165.37 StockQuote symbol: "GOOG" name: "Google Inc." StockQuote exchange: "NASD" symbol: "MSFT" quote: 663.97 name: "Microsoft Corp." exchange: "NASD" quote: 33.73 StockQuote R3 symbol: "AAPL" W2’’ name: "Apple Inc." exchange: "NASD" quote: 165.37 STRENGTH=1 © 2009, PrismTech. All Rights Reserved
  • 42. Eventual Consistency & R/W Caches DataReader DataReader 1 1 2 1 DataWriter 1 1 3 1 Proprietary Information - Distribution without Expressed Written Permission is Prohibited. 2 1 1 2 Topic DataReader 1 2 2 3 3 1 DataReader Cache 2 2 2 3 3 1 Topic 1 1 DataReader Cache 2 Topic 1 DDS DataWriter Cache 3 1 Topic DataReader Cache Under an Eventual Consistency Model, DDS guarantees that all matched Reader Caches will eventually be identical of the respective Writer Cache © 2009, PrismTech. All Rights Reserved
  • 43. QoS Impacting the Consistency Model The DDS Consistency Model is a property that can be associated to Topics or further refined by Reader/Writers. The property is controlled by the following QoS Policies: ‣ DURABILITY ‣ VOLATILE | TRANSIENT_LOCAL | TRANSIENT | PERSISTENT ‣ LIFESPAN Proprietary Information - Distribution without Expressed Written Permission is Prohibited. ‣ RELIABILITY ‣ RELIABLE | BEST_EFFORT ‣ DESTINATION ORDER ‣ SOURCE_TIMESTAMP | DESTINATION_TIMESTAMP QoS Policy Applicability RxO Modifiable DURABILITY T, DR, DW Y N LIFESPAN T, DW - Y RELIABILITY T, DR, DW Y N DESTINATION ORDER T, DR, DW Y N © 2009, PrismTech. All Rights Reserved
  • 44. QoS Impacting the Consistency Model DURABILITY RELIABILITY DESTINATION_ORDER LIFESPAN Eventual Consistency VOLATILE RELIABLE SOURCE_TIMESTAMP INF. (No Crash / Recovery) Eventual Consistency TRANSIENT_LOCAL RELIABLE SOURCE_TIMESTAMP INF. Proprietary Information - Distribution without Expressed Written Permission is Prohibited. (Reader Crash / Recovery) Eventual Consistency TRANSIENT RELIABLE SOURCE_TIMESTAMP INF. (Crash/Recovery) Eventual Consistency PERSISTENT RELIABLE SOURCE_TIMESTAMP INF. (Crash/Recovery) Weak Consistency ANY ANY DESTINATION_TIMESTAMP ANY Weak Consistency ANY BEST_EFFORT ANY ANY Weak Consistency ANY ANY ANY N © 2009, PrismTech. All Rights Reserved
  • 45. Eventual Consistency @ Work DURABILITY RELIABILITY DESTINATION_ORDER LIFESPAN Eventual Consistency (Reader TRANSIENT_LOCAL RELIABLE SOURCE_TIMESTAMP INF. Crash / Recovery) {A} Eventual Consistency TRANSIENT RELIABLE SOURCE_TIMESTAMP INF. {B} (Crash/Recovery) Weak Consistency ANY ANY ANY N {J} Proprietary Information - Distribution without Expressed Written Permission is Prohibited. S = {A, D} S1 P = {A, B} B P1 m A F J D C P = {D, C, J} P2 K E S = {A} S4 © 2009, PrismTech. All Rights Reserved
  • 46. Eventual Consistency @ Work DURABILITY RELIABILITY DESTINATION_ORDER LIFESPAN Eventual Consistency (Reader TRANSIENT_LOCAL RELIABLE SOURCE_TIMESTAMP INF. Crash / Recovery) {A} Eventual Consistency TRANSIENT RELIABLE SOURCE_TIMESTAMP INF. {B} (Crash/Recovery) Weak Consistency ANY ANY ANY N {J} Proprietary Information - Distribution without Expressed Written Permission is Prohibited. S = {A, D} S1 P = {A, B} B P1 m A A F J D C P = {D, C, J} P2 K E S = {A} S4 © 2009, PrismTech. All Rights Reserved
  • 47. Eventual Consistency @ Work DURABILITY RELIABILITY DESTINATION_ORDER LIFESPAN Eventual Consistency (Reader TRANSIENT_LOCAL RELIABLE SOURCE_TIMESTAMP INF. Crash / Recovery) {A} Eventual Consistency TRANSIENT RELIABLE SOURCE_TIMESTAMP INF. {B} (Crash/Recovery) Weak Consistency ANY ANY ANY N {J} Proprietary Information - Distribution without Expressed Written Permission is Prohibited. S = {A, D} S1 P = {A, B} B A P1 m A A F J D C P = {D, C, J} P2 K E S = {A} S4 © 2009, PrismTech. All Rights Reserved A
  • 48. Eventual Consistency @ Work DURABILITY RELIABILITY DESTINATION_ORDER LIFESPAN Eventual Consistency (Reader TRANSIENT_LOCAL RELIABLE SOURCE_TIMESTAMP INF. Crash / Recovery) {A} Eventual Consistency TRANSIENT RELIABLE SOURCE_TIMESTAMP INF. {B} (Crash/Recovery) Weak Consistency ANY ANY ANY N {J} Proprietary Information - Distribution without Expressed Written Permission is Prohibited. S = {A, D} S1 P = {A, B} B A P1 m B A A F J D C P = {D, C, J} P2 K E S = {A} S4 © 2009, PrismTech. All Rights Reserved A
  • 49. Eventual Consistency @ Work DURABILITY RELIABILITY DESTINATION_ORDER LIFESPAN Eventual Consistency (Reader TRANSIENT_LOCAL RELIABLE SOURCE_TIMESTAMP INF. Crash / Recovery) {A} Eventual Consistency TRANSIENT RELIABLE SOURCE_TIMESTAMP INF. {B} (Crash/Recovery) Weak Consistency ANY ANY ANY N {J} Proprietary Information - Distribution without Expressed Written Permission is Prohibited. S = {A, D} S1 P = {A, B} B B A P1 m A A F J D C P = {D, C, J} P2 K E S = {A} S4 © 2009, PrismTech. All Rights Reserved A
  • 50. Eventual Consistency @ Work DURABILITY RELIABILITY DESTINATION_ORDER LIFESPAN Eventual Consistency (Reader TRANSIENT_LOCAL RELIABLE SOURCE_TIMESTAMP INF. Crash / Recovery) {A} Eventual Consistency TRANSIENT RELIABLE SOURCE_TIMESTAMP INF. {B} (Crash/Recovery) Weak Consistency ANY ANY ANY N {J} Proprietary Information - Distribution without Expressed Written Permission is Prohibited. S = {A, D} S1 P = {A, B} B B A P1 m S= {A, B, J} A A F S2 J D C P = {D, C, J} P2 K E S = {A} S4 © 2009, PrismTech. All Rights Reserved A
  • 51. Eventual Consistency @ Work DURABILITY RELIABILITY DESTINATION_ORDER LIFESPAN Eventual Consistency (Reader TRANSIENT_LOCAL RELIABLE SOURCE_TIMESTAMP INF. Crash / Recovery) {A} Eventual Consistency TRANSIENT RELIABLE SOURCE_TIMESTAMP INF. {B} (Crash/Recovery) Weak Consistency ANY ANY ANY N {J} Proprietary Information - Distribution without Expressed Written Permission is Prohibited. S = {A, D} S1 P = {A, B} B B A P1 m S= {A, B, J} A A F S2 J D C BA P = {D, C, J} P2 K E S = {A} S4 © 2009, PrismTech. All Rights Reserved A
  • 52. Eventual Consistency @ Work DURABILITY RELIABILITY DESTINATION_ORDER LIFESPAN Eventual Consistency (Reader TRANSIENT_LOCAL RELIABLE SOURCE_TIMESTAMP INF. Crash / Recovery) {A} Eventual Consistency TRANSIENT RELIABLE SOURCE_TIMESTAMP INF. {B} (Crash/Recovery) Weak Consistency ANY ANY ANY N {J} Proprietary Information - Distribution without Expressed Written Permission is Prohibited. S = {A, D} S1 B B A m S= {A, B, J} A F S2 J D C BA P = {D, C, J} P2 K E S = {A} S4 © 2009, PrismTech. All Rights Reserved A
  • 53. Eventual Consistency @ Work DURABILITY RELIABILITY DESTINATION_ORDER LIFESPAN Eventual Consistency (Reader TRANSIENT_LOCAL RELIABLE SOURCE_TIMESTAMP INF. Crash / Recovery) {A} Eventual Consistency TRANSIENT RELIABLE SOURCE_TIMESTAMP INF. {B} (Crash/Recovery) Weak Consistency ANY ANY ANY N {J} Proprietary Information - Distribution without Expressed Written Permission is Prohibited. S = {A, D} S1 B B A m S= {A, B, J} A F S2 J D C BA P = {D, C, J} S= {A, B, D, J} P2 K E S3 S = {A} S4 © 2009, PrismTech. All Rights Reserved A
  • 54. Eventual Consistency @ Work DURABILITY RELIABILITY DESTINATION_ORDER LIFESPAN Eventual Consistency (Reader TRANSIENT_LOCAL RELIABLE SOURCE_TIMESTAMP INF. Crash / Recovery) {A} Eventual Consistency TRANSIENT RELIABLE SOURCE_TIMESTAMP INF. {B} (Crash/Recovery) Weak Consistency ANY ANY ANY N {J} Proprietary Information - Distribution without Expressed Written Permission is Prohibited. S = {A, D} S1 B B A m S= {A, B, J} A F S2 J J D D C BA P = {D, C, J} S= {A, B, D, J} P2 K E S3 S = {A} JB S4 © 2009, PrismTech. All Rights Reserved A