JR46920: CMVC 228886 228938 - Configure data cache to delay after sending invalidations to specified object caches.

7.0.0.9 for Developer Express
7.0.0.9 for Developer Professional
7.0.0.9 for Developer Enterprise
7.0.0-WS-WCServer-FP009
JR47295 - WebSphere Commerce Search cumulative Interim Fix in V7.0 Fix Pack 6
WebSphere Commerce Version 7.0.0.9 Fix Pack

APAR status

• Closed as program error.

Error description

• DynaCache invalidation processing can take several milliseconds
  to complete in each application server node JVM where stale
  cached information may need to be removed.  It is possible that
  two URL requests sent to two different servers, where the first
  request makes a change to the database and issues dynacache
  invalidations, which are sent to the second server, and the
  second request is sent to the second server immediately after
  the first request finishes and relies on the cache invalidation
  having completed in the second server, that the invalidation
  operation may not have completed at the second server before the
   second request is processed.  In such a case, the second
  request may use stale data from the cache, and return incorrect
  results in its response.
  

Local fix

• Use session affinity to cause multiple requests from the same
  user session to go to the same application server.
  

Problem summary

• USERS AFFECTED:
  WebSphere Commerce users who do not use session affinity to
  cause multiple requests from the same user session to go to the
  same application server.
  
  PROBLEM ABSTRACT:
  Configure data cache to delay after sending invalidations to
  specified object caches.
  
  BUSINESS IMPACT:
  Stale data to be used during the processing of a request
  
  RECOMMENDATION:
  

Problem conclusion

• A new data cache configuration causes the application server
  request processing to wait for a specified number of
  milliseconds after issuing cache invalidations to any of
  specified object caches.  For example, to configure a delay of
  100 milliseconds after sending invalidations to the
  WCSessionDistributedMapCache object cache, add the following
  line to the CrossTransactionCache tag.  (The
  CrossTransactionCache tag is found within the InstanceProperties
   tag in the wc-server.xml instance configuration file.)
  
  <WCSessionDistributedMapCache
  delayAfterInvalidationMilliseconds="100" />
  
  Refer to the following URL for more information about the
  CrossTransactionCache tag:
  
  http://pic.dhe.ibm.com/infocenter/wchelp/v7r0m0/topic/com.ibm.co
  mmerce.admin.doc/concepts/cdcaddcomdatcacheconfig.htm
  -------------------------------------------------------------
  The latest available maintenance information can be obtained
  from the Recommended Fixes for WebSphere Commerce technote:
  http://www.ibm.com/support/docview.wss?rs=3046&uid=swg21261296
  

Temporary fix

Comments

APAR Information

• APAR is sysrouted FROM one or more of the following:

• APAR is sysrouted TO one or more of the following:

Fix information

• Fixed component name

  WC BUS EDITION

• Fixed component ID

  5724I3800

Applicable component levels

• R700 PSY

     UP