PK24146; 6.0.2.3: Filter out expiration and LRU based Invalidation Events

Download Description

PK24146 resolves the following problem:

ERROR DESCRIPTION:
Dynacache propagates invalidations to all servers in the replication domain for entries that have expired or LRU evicted from the cache. In majority of the scenarios, it does not make sense to pass these invalidations along to other members because the exact same invalidations will be triggered in their own Java™ Virtual Machines. Therefore the application server and in turn the application gets a serious performance boost by not passing on these invalidations.

LOCAL FIX:

PROBLEM SUMMARY

USERS AFFECTED:
WebSphere® Application Server version 6.0.2 users of clustered, replicated cache configurations who do not have combinations of shared and not shared cache entries and do not wish to send notification events for expirations and LRU invalidations.


PROBLEM DESCRIPTION:
Needless notifications are sent in the case where you have entries that do not combine shared and not shared. Sending of these notifications affects performance

RECOMMENDATION:
None

Dynacache sends invalidation notifications to all cluster members in all situations. In some cases, these invalidation events are unneeded and can become a performance drain.

PROBLEM CONCLUSION:
Dynacache added two custom properties to disable sending of notifications in two situations: invalidations based on LRU evication and invalidations based on time-out. These custom JVM properties are as follows:

com.ibm.ws.cache.CacheConfig.filterLRUInvalidation
com.ibm.ws.cache.CacheConfig.filterTimeOutInvalidation

The fix for this APAR is currently targeted for inclusion in Fix Pack 6.0.2.13. Refer to the recommended updates page for delivery information:
http://www.ibm.com/support/docview.wss?rs=180&uid=swg27004980