Share point 2013’s distributed cache service 6.0 (1)

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Passionate
Employees
Innovative
Services
Delighted
Customers
Harnessing the Power of
SharePoint 2013’s
Distributed Cache Service

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© Hexaware Technologies. All rights reserved. | www.hexaware.com
What is Distributed Cache?
 A distributed cache is an extension of the
traditional concept of cache used in a single
locale.
 A distributed cache may span multiple servers so
that it can grow in size and in transactional
capacity.

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SharePoint 2013 Distributed Cache
The Distributed Cache (DC) service is built on top of the Windows Server AppFabric Cache.
The Distributed Cache (DC) service provides in-memory caching services to several
features in SharePoint 2013 as listed below
Authentication
Security Trimming
Page load performance
Social Features, Newsfeeds

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Architectural Highlights
 In SharePoint 2013, it creates session token
during user login for any of the user
authentication method used, either windows
authentication or forms authentication or SAML
token by external identity provider.
 Prior to SharePoint 2013, the session token
cache was stored at server-local cache. In
SharePoint 2013, session security tokens are
stored centrally in a Distributed Cache Service’s
Logon Token Cache. This architectural
improvement, made tokens accessible across
the farm, to all WFEs.

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 User Profile Service Application (UPA) Proxies retrieve configuration details from their
associated UPAs & databases; and cache those details in several per-process in-
memory cache and all such cache information is resident in server memory. Following
Settings are stored in cache
 URLs for MySite portals
 Following limits
 UPA sync configuration (e.g. whether to sync inactive users)
 Newsfeed settings
 Activity Feed

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 Prior to SP-2013 ViewState data was stored at the server end, which lead to problem
that subsequent requests would have to be routed to the same server where ViewState
was originally cached. This problem was solved in SP-2013 by storing as key pair value
of GUID and ViewState to distributed ViewState cache.

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 For user profiles, it enables everything to be
“in sync” and have minimal visible POSTs
back to the server. As the distributed cache
is resident in server memory the browser
have to post back to Distributed Cache
Service. In background data is persisted to
database from the distributed cache to the
database. During post back browser doesn't
have to wait to get data persisted in
database. This drastically improves page
response performance.

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Distributed Caching - Installation
 SharePoint 2013’s prerequisites installer takes
care of installing the Windows Server AppFabric
and configuring it for cache operations on your
behalf.
 There is no initial action required on the part of
administrators to get the Distributed Cache
service installed and operational in their
SharePoint 2013 environment.

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Default DC Configuration
 Default Memory allocation to DC Service is 10% of total physical memory.
 From that it uses half of that memory allocation for data storage i.e. it uses 5% of cache
size.
 The other half of that memory allocation is used for memory management overhead.
 When the cached data grows, the DC service uses the entire 10% of the allocated
memory.

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DC configuration for small farm
Important Note: DC Service has
to be turned ON all the WFE
servers.
Distributed Cache is
on all WFE Servers

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DC configuration for medium farm (10,000+ users)
1. It’s recommended to have dedicated DC Server allocated to the SharePoint
Farm.
2. Use the following method to calculate how much memory can be assigned to
the DC service.
 Determine the total physical memory on the server. For this example, we
will use 16 GB as the total physical memory available on the server
 Reserve 2 GB of memory for other processes and services that are
running on the cache host. i.e. 16 GB – 2 GB = 14 GB. This remaining
memory is allocated to the Distributed Cache service
 Take half of the remaining memory, and convert it to MB. For example,
14 GB/2 = 7 GB or 7000 MB. This is the cache size of the DC service

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DC configuration for medium farm (10,000+ users)
APP 03 is made
dedicated Distributed
Cache Server

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Wrongly configured DC…
Page render time around 9-10 seconds!!

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DC Configured Correctly..
After implementing the Dedicated DC service to a SharePoint farm and correctly updating
the memory allocation the page rendered time improved drastically!
Page render time NOT more than 2 seconds..

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DC Configuration - Benefits
 As it creates unique session for any of the
user authentication technique like window
authentication or forms authentication or
external identity provider, in a subsequent
calls, it bypasses the need to redirect to
external identity providers and additional
user prompts, in a way avoiding evident
response time delay.
 Creation of unique session token and
caching the token avoids the multiple steps
of regeneration of session token and saving
the time to some extent.

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 Session tokens are centralized cached and
webserver can trace token using windows
identity or session cookie, the user can access
any of the webservers without the need to re-
login.
 As ViewState data is stored in Distributed Cache, the problem
related to request routing is resolved and page response time
is improved to a large extent

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 Social features like URLs for MySite
portals, Following limits, UPA sync
configuration, Newsfeed settings, Activity
Feed are stored in Distributed cache and
configured to Sync all the User Profile
Applications (UPAs). Also during POST
back action, browser have to POST back to
DC and need not wait till data gets
persisted in database. This improved the
page performance drastically.

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Challenges & Tips
Following slides covers some of the challenges faced during
real life implementations of Distributed Caching Service in a
medium farm of about 10000 users.
All the tips provided here are actual resolutions provide by our
“Hexaware SharePoint Expert” team

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Challenge # 1
You try to interact with the cache service and find that the service is not functioning
correctly.
Tip: Restarting the cluster is a simple first step that will often clear up any issues. Run
the Command Restart-CacheCluster

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Challenge # 2
You get an error related to the registry.
Tip: It usually means that the host you are working with is not part of a cluster and it
sneeds to be added.
Run the Add-SPDistributedCacheServiceInstance command to add.

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Challenge # 3
You try to add a cache host to the cluster and you get error ”TCP port already in use”

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Challenge # 4
You try to remove a cache host from the cluster and you get error “cacheHostInfo is
null”.

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Tip for Challenge #3 & #4
Error showed in Challenge#3 & #4 usually means that the server was
previously part of a cluster and wasn’t added or removed correctly.
To resolve the issue execute following commands
• $instanceName ="SPDistributedCacheService
Name=AppFabricCachingService"
• $serviceInstance = Get-SPServiceInstance | ?
{($_.service.tostring()) -eq $instanceName –and ($_.server.name)
-eq "<Your Server Name>"}
• $serviceInstance.Delete()
• Add-SPDistributedCacheServiceInstance

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Challenge # 5
There was a medium farm with dedicated DC server and was facing page performance
issue. When traced the ULS logs, found following error.
Unexpected error occurred in method 'GetObject' , usage 'Distributed Logon Token Cache'
– Exception crosoft.ApplicationServer.Caching.DataCacheException:
ErrorCode<ERRCA0017>:SubStatus<ES0006>:There is a temporary failure. Please retry
later. (One or more specified cache servers are unavailable, which could be caused by
busy network or servers. For on-premises cache clusters, also verify the following
conditions. Ensure that security permission has been granted for this client account, and
check that the AppFabric Caching Service is allowed through the firewall on all cache hosts.
Also the MaxBufferSize on the server must be greater than or equal to the serialized object
size sent from the client.

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Tip for Challenge #5
1. Update default DC parameters
2. Change parameter values for Security Token Service followed by IISRESET on all
servers in the.
 Set MaxServiceTokenCacfarmheItems to 1500
 Set MaxLogonTokenCacheItems to 1500
DC Parameters Default Value Recommended
MaxBufferPoolSize 268435456 1073741824
MaxBufferSize 8388608 33554432
ChannelOpenTimeOut 20 3000
RequestTimeout 20 3000
MaxConnectionsToServer 2 100

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Be Aware
“The Distributed Cache service can end up
in a non-functioning or unrecoverable state
if you do not follow the procedures. In
extreme scenarios, you might have to
rebuild the server farm“

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Best Thing..
If you set DC Configurations Right then
your SharePoint Farm will have an
advantage of Highest Performance and
Improved Scalability…

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Employees
Innovative
Services
Delighted
Customers
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Share point 2013’s distributed cache service 6.0 (1)

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