In some systems a data-centric approach to sharing data between processing nodes is much more natural than a message-centric approach. In this presentation we explore the benefits of data-centricity and look specifically at DDS a data-centric pub/sub technology.

1. In the Age of IoT
Think Data-Centric
Toby McClean
Chief Solutions Architect
toby@prismtech.com

2. CopyrightPrismTech,2015
Message-Centrixity is Natural…
…but can lead to misinterpretation

3. CopyrightPrismTech,2015
The overall system may be more complex to build:
message is an information container, with a header and
some payload;
applications get fragmented pieces of information;
applications need to rebuild the overall state of the system;
applications have to deal with coherency
Complexity in Messaging

4. CopyrightPrismTech,2015
Can be complex, time consuming and error prone
Decrease your productivity and delivery velocity
Increase time to market
Increase development, maintenance and evolution cost
Impact on System Development

5. DATA-CENTRICITY

6. CopyrightPrismTech,2015
Model physical and logical entities as they are with their
unique identity;
state;
structure; and
lifecycle.
Each is explicit and managed by the platform
Data-Centricity

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Data is the contract
Create views and queries on data
Capture relationships in the data
Decoupled architecture (in Space and Time)
Transactional communications
Benefits of Data-Centricity

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Data-Centric Approaches

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Move data to where it needs to be when it needs to be there
In charge of maintaining the state of the overall system even in
case of failure, so that the latest consistent state of the system
will always be known and will always be available (even for late
joining applications)
A Data-Centric Pub/Sub Platform

10. Applications can autonomously
and asynchronously read and
write data enjoying spatial and
temporal decoupling
DDS Global Data Space
...
Data
Writer
Data
Writer
Data
Writer
Data
Reader
Data
Reader
Data
Reader
Data
Reader
Data
Writer
TopicA
QoS
TopicB
QoS
TopicC
QoS
TopicD
QoS
Virtualized Data
Space

11. Built-in dynamic discovery
isolates applications from
network topology and
connectivity details
DDS Global Data Space
...
Data
Writer
Data
Writer
Data
Writer
Data
Reader
Data
Reader
Data
Reader
Data
Reader
Data
Writer
TopicA
QoS
TopicB
QoS
TopicC
QoS
TopicD
QoS
Dynamic Discovery

12. QoS policies allow to express
temporal and availability
constraints for data
DDS Global Data Space
...
Data
Writer
Data
Writer
Data
Writer
Data
Reader
Data
Reader
Data
Reader
Data
Reader
Data
Writer
TopicA
QoS
TopicB
QoS
TopicC
QoS
TopicD
QoS
QoS - Enabled

13. No single point of failure or
bottleneck
DecentraliZed
Data Space Data
Writer
Data
Writer
Data
Writer
Data
Reader
Data
Reader
Data
Reader
Data
Writer
TopicA
QoS
TopicB
QoS
TopicC
QoS
TopicD
QoS
TopicD
QoS
TopicD
QoS
TopicA
QoS

14. Connectivity is dynamically
adapted to chose the most
effective way of sharing data
Adaptive Connectivity
Data
Writer
Data
Writer
Data
Writer
Data
Reader
Data
Reader
Data
Reader
Data
Writer
TopicA
QoS
TopicB
QoS
TopicC
QoS
TopicD
QoS
TopicD
QoS
TopicD
QoS
TopicA
QoS
The communication between
the DataWriter and matching
DataReaders can be peer-to-
peer exploiting UDP/IP
(Unicast and Multicast)or
TCP/IP
The communication between
the DataWriter and matching
DataReaders can be
“brokered” but still
exploiting UDP/IP (Unicast
and Multicast)or TCP/IP

15. USE CASES

16. This slides have been crafted by Angelo Corsaro
Any use of these slides that does include me as Author/Co-Author is plagiaryFog Computing

17. This slides have been crafted by Angelo Corsaro
Any use of these slides that does include me as Author/Co-Author is plagiary
Smart Factory
0.5 TB of data
produced per day

18. CopyrightPrismTech,2015
Smart City
data centric platform for the
City Operating System
Tens of thousands of devices
connected
by Vortex

19. Smart Green houses
virtualize sensor data and to
distribute actions and insights

20. CopyrightPrismTech,2014
Smart-Grid
20ms deadline for phase
alignment data

21. Smart Lightbulbs
96Kbytes Memory
Connected
Medical Devices
12 msec period for
pleath data
Peer-to-Peer
connectivity

22. CopyrightPrismTech,2015
Messaging works well for telemetry and events
Data-centricity can also be used for telemetry and events
Data-centricity is natural for virtualizing devices
Data-centricity works well for managing state
Summary

23. CopyrightPrismTech,2015