JR47936: CMVC 225899 - This fix is to avoid LRU eviction of event cache entries for marketing activities.

APAR status

• Closed as program error.

Error description

• Dialog activities intermittently stop working and additional
  customers do not participate in the dialog activity. After
  refreshing the Marketing registry, the dialog activity begins
  working again. However, after a period of time, the dialog
  activity stops working again.
  

Local fix

• Refresh the Marketing registry or increase the size of the
  marketing cache (DM_Cache).
  

Problem summary

• USERS AFFECTED:
  WebSphere Commerce users on v7 using Management Center Marketing
  
  PROBLEM ABSTRACT:
  Dialog activities intermittently stop working.
  
  BUSINESS IMPACT:
  Marketing dialog activities may not include all customers
  
  RECOMMENDATION:
  

Problem conclusion

• For web and dialog activities, a number of triggers, targets,
  and actions rely on detecting the occurrence of an event. When
  the event is detected, the event is forwarded to applicable
  activities interested in that event. For every request, the list
   of events to listen to are in the cache, avoiding an expensive
  database lookup on every request.
  
  Event cache entries are cached with a high priority with the
  expectation these entries would remain in the cache.  However,
  in configurations where the cache size is small and there are a
  lot of marketing activities, these event cache entries were
  being LRU (Least Recently Used) evicted from the cache.  When
  there are a lot of cache misses on the cache, and the cache size
  is not large, then even high priority cache entries can get
  evicted from the cache. When an event cache entry is removed
  from the cache, any activities associated with those evicted
  events may stop working.  Once the event cache entries were
  removed from the cache, only a cache clear would reload the
  event cache entries into the cache.
  
  The code was changed to move the event cache entries from the
  marketing cache into an internal hash table. This will prevent
  the event cache entries from being LRU evicted.
  -------------------------------------------------------------
  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