JR46873: GROUP CACHE SYNC ACROSS CLUSTER SERVERS LEADS TO CONCURRENT DB ACCESS AND LOCK ISSUES AND NUMEROUS CWLLG0446I MESSAGES LOGGED

Version 7.5.1 Fix Pack 2 for the IBM Business Process Manager products

APAR status

• Closed as program error.

Error description

• A group cache is available on every server of a cluster.  Upon
  changes to the cache on one server, in some cases the cache is
  reset and notifications are sent to instances of the other
  caches.
  In effect, all cache instances simultaneously attempt to access
  same DB entries leading to concurrency issues.
  .
     One symptom of this problem is the server is logging this
  type of message continuously:
  wle           I   CWLLG0446I: Group Group_Name is being checked
  for new updates...
  

Local fix

• N/A
  

Problem summary

• A group cache is available on every server of a cluster.  Upon
  changes to the cache on one server, in some cases the cache is
  reset and
  notifications are sent to instances of the other caches.
  In effect, all cache instances simultaneously attempt to access
  same DB entries leading to concurrency issues.
  

Problem conclusion

• Avoid unnecessary GroupInfo cache updates due to differences in
  group description
  
  FIX AVAILABILITY:
  
  iFix for 7.5.1.0 is available on Fix Central, search for APAR
  JR46873 at http://www.ibm.com/support/fixcentral/
  
  When obtaining any of the above fixes, be sure to download the
  accompanying readme, for itself and any prerequisite fixes, and
  review them thorougly.
  

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

  BPM STANDARD

• Fixed component ID

  5725C9500

Applicable component levels

• R751 PSY

     UP