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Distributed Catch Service in SharePoint 2013

By krishna on 12/28/2015

In SharePoint 2013 there is a new service called distributed catch. The Distributed catch service is built on windows AppFabric, which implements the AppFabric catching service window server AppFabric installs with the prerequisites for SharePoint Server 2013.

The Distributed Cache service provides in-memory caching services and does not have a dependency on databases for several features in SharePoint Server 2013. Some of the features that use the Distributed Cache service include:

  • Newsfeeds
  • Authentication
  • OneNote client access
  • Security Trimming
  • Page load performance

 

When the service is enabled, these features use the Distributed Cache for quick data retrieval. Blob Cache and Output Cache do not use a distributed caching service since these types of cache exist on each Web Front End server in the farm.

 

Name

Cache name

Description

Login Token Cache

DistributedLogonTokenCache

This cache stores the security token issued by a Secure Token

Service for use by any web server in the server farm.

Any web server that receives a request for resources can access

the security token from the cache, authenticate the user, and

provide access to the resources requested.

Feed Cache

DistributedActivityFeedCache

This cache stores activities and conversations

for use by the feeds on a user's My Site.

Last Modified Time Cache

DistributedActivityFeedLMTCache

This cache stores time stamp information

for all Feed Cache entities

OneNote Throttling

DistributedBouncerCache

Access Cache

DistributedAccessCache

Search Query Web Part

DistributedSearchCache

Security Trimming Cache

DistributedSecurityTrimmingCache

App Token Cache

DistributedServerToAppServerAccessTokenCache

View State Cache

DistributedViewStateCache

Default Cache

DistributedDefaultCache

This cache can be used by any feature.

Example

  • The feed queries the Last Modified Time Cache to retrieve time stamp information and metadata of recent activities.
  • This information is then used as input to query the feed cache to retrieve activity data.
  • The requested feed is then constructed by using the activity data retrieved from the Feed Cache.

For each entity, the feed cache assigns a portion of memory known as a cache bucket to store recent activity data for that entity. Entities include users, tags, sites, and documents. Cache buckets only store recent activities. Many cache buckets will be empty because not all entities will have recent activities. By default, recent activities are kept for seven days.

SharePoint 2013
Distributed Catch Service
SharePoint Server
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