Replicating content store

A Replicating content store is a content store implementation that is able to replicate content between stores. This topic provides information on Replicating content store and its configuration details with an example.

The Replicating content store contains a primary store and a set of secondary stores. The order in which the stores appear in the list of participating stores is important. The first store in the list is known as the primary store. Content can be read from any of the stores, as if it were a single store. When the replicator goes to fetch content, the stores are searched from first to last. The stores should therefore, be arranged in order of speed.

When replication is disabled, content is written to the primary store only. The other stores are used to retrieve content and the primary store is not updated with the content.

For example, if you have a fast (and expensive) local disk, you can use this as your primary store for best performance. The old infrequently used files may be stored on lower cost, slower storage.

Example configuration for tiered storage

The following configuration defines an additional tiered storage solution. The default content store is not changed. An additional set of secondary stores is defined (tier1, tier2 and tier3). As content ages (old infrequently used files), it can be moved to lower tiers. If the tiered storage is slow, a Caching content store can be placed in front.

In your SkyVault-global.properties file, define three new folder locations:
- dir.contentstore1=${dir.root}/tier1
- dir.contentstore2=${dir.root}/tier2
- dir.contentstore3=${dir.root}/tier3

The replicating-store-context.xml file enables a replicating content store. The content of this file is shown below. Place the replicating-store-context.xml file in your <TOMCAT_HOME>/shared/classes/alfresco/extension folder.

<?xml version='1.0' encoding='UTF-8'?>
<!DOCTYPE beans PUBLIC '-//SPRING//DTD BEAN//EN' 'http://www.springframework.org/dtd/spring-beans.dtd'>
<beans>
    <bean id="defaultContentStore" class="org.alfresco.repo.content.filestore.FileContentStore">
      <constructor-arg>
        <value>${dir.contentstore}</value>
      </constructor-arg>
    </bean>

    <bean id="tier1ContentStore" class="org.alfresco.repo.content.filestore.FileContentStore">
      <constructor-arg>
         <value>${dir.contentstore1}</value>
      </constructor-arg>
    </bean>
          
    <bean id="tier2ContentStore" class="org.alfresco.repo.content.filestore.FileContentStore">
       <constructor-arg>
         <value>${dir.contentstore2}</value>
       </constructor-arg>
    </bean>
   
    <bean id="tier3ContentStore" class="org.alfresco.repo.content.filestore.FileContentStore">
       <constructor-arg>
         <value>${dir.contentstore3}</value>
       </constructor-arg>
<!-- Uncomment the property below to add content filesize limit.
<property name="contentLimitProvider" ref="defaultContentLimitProvider"/>-->
</bean>

<!-- this is the replicating content store - the name fileContentStore overrides the SkyVault default store-->

   <bean id="fileContentStore" class="org.alfresco.repo.content.replication.ReplicatingContentStore" >
      <property name="retryingTransactionHelper" ref="retryingTransactionHelper" />
      <property name="primaryStore" ref="defaultContentStore" />
      <property name="secondaryStores">
        <list>
           <ref bean="tier1ContentStore" />
           <ref bean="tier2ContentStore" />
           <ref bean="tier3ContentStore" />
        </list>
      </property>

      <property name="outbound"><value>false</value></property>
   </bean>
</beans>

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