Multiple caches use same distributed scheme, what about cachestore config?

Question

Hi,
If a distributed scheme is configured with read-write-backing-map, will ALL caches be required to define the cachestore configuration if the caches are using the same distributed scheme? For example, we have two caches "ExpireSessions" and "Customer" which are using distributed-scheme. But only "ExpiredSession" cache needs to have read-write-backing-map (for transaction lite) AND the "ExpiredSession" needs to be persisted to DB. For "Customer" cache, it does NOT need to have read-write-backing-map AND it does NOT need to be persisted to DB. Currently, we have the following configuration which also has the "write-delay" and "cache-store" configurations for the "Customer" cache.
Is it possible not have cache store configuration (write-delay, cache-store) configuration for the Customer cache even though it is using the same distributed-scheme as "ExpiredSession" cache (which needs the cache store configuration?) We think it probably can remove some of the overhead and improve efficiency) for the 'Customer' cache operations.
Or is it required to have a separate distributed-scheme for "Customer" cache without eh cache store configuration? But it then will have use separate/additional thread pools for the distributed service?
Any suggestions?
Thanks in advance for your help.
<cache-name>ExpiredSessions</cache-name>
<scheme-name>default-distributed</scheme-name>
<init-params>
<init-param>
<param-name>expiry-delay</param-name>
<param-value>2s</param-value>
</init-param>
<init-param>
<param-name>write-delay</param-name>
<param-value>1s</param-value>
</init-param>
<init-param>
<param-name>cache-store</param-name>
<param-value>xxx.xxx.DBCacheStore</param-value>
</param-value>
</init-param>
</init-params>
<cache-mapping>
<cache-name>Customer</cache-name>
<scheme-name>default-distributed</scheme-name>
<init-params>
<init-param>
<param-name>cache-store</param-name>
<param-value>xxx.xxx.EmptyCacheStore</param-value>
</init-param>
<init-param>
<param-name>write-delay</param-name>
<param-value>24h</param-value>
</init-param>
</init-params>
</cache-mapping>
<!--
Default Distributed pricing-distributedcaching scheme.
-->
<distributed-scheme>
<scheme-name>default-distributed</scheme-name>
<service-name>XXXDistributedCache</service-name>
<thread-count>16</thread-count>
<backing-map-scheme>
<read-write-backing-map-scheme>
<scheme-ref>rw-bm</scheme-ref>
</read-write-backing-map-scheme>
</backing-map-scheme>
<autostart>true</autostart>
</distributed-scheme>

Answer 1

Hi,
Yes, you can use the same service for different caches with different configuration. You need to define base service configuration with the common parameters and all the caches with have their schemes (not services) refering the base service configuration along with their own configuration. For example,
          <cache-mapping>
               <cache-name>ExpiredSessions</cache-name>
               <scheme-name>default-distributed</scheme-name>
               <init-params>
                    <init-param>
                         <param-name>expiry-delay</param-name>
                         <param-value>2s</param-value>
                    </init-param>
                    <init-param>
                         <param-name>write-delay</param-name>
                         <param-value>1s</param-value>
                    </init-param>
                    <init-param>
                         <param-name>cache-store</param-name>
                         <param-value>xxx.xxx.DBCacheStore</param-value>                    
                    </init-param>
               </init-params>
          </cache-mapping>
          <cache-mapping>
               <cache-name>Customer</cache-name>
               <scheme-name>default-distributed</scheme-name>
          </cache-mapping>
          </caching-scheme-mapping>
               <!-- Default Distributed pricing-distributedcaching scheme. -->
          <caching-schemes>
               <distributed-scheme>
                    <scheme-name>default-distributed</scheme-name>
                    <service-name>XXXDistributedCache</service-name>
                    <thread-count>16</thread-count>
                    <autostart>true</autostart>
               </distributed-scheme>
               <distributed-scheme>
                    <scheme-name>default-customer</scheme-name>
                    <scheme-ref>default-distributed</scheme-ref>
                    <backing-map-scheme>
                         <local-scheme />
                    </backing-map-scheme>
               </distributed-scheme>
               <distributed-scheme>
                    <scheme-name>default-expiry</scheme-name>
                    <scheme-ref>default-distributed</scheme-ref>
                    <backing-map-scheme>
                         <read-write-backing-map-scheme>
                              <scheme-ref>rw-bm</scheme-ref>
                         </read-write-backing-map-scheme>
                    </backing-map-scheme>
               </distributed-scheme>
          </caching-schemes>
Hope this helps!
Cheers,
NJ