JR53918: THREADS HANG IN GROUPCORE.PROCESSDELETEUSERGROUPS WHILE THE SERVER STARTS

7.5.1.2-WS-BPM-IFJR53918
Version 8.5 Refresh Pack 7 for the IBM Business Process Manager products

APAR status

• Closed as program error.

Error description

• You might experience threads hanging while the server starts as
  the server tries to synchronize a large number of user group
  definitions (more than 50 thousand entries) and the number of
  retrieved groups is greater than the number of groups already
  available in the database.
  
  You might see hanging threads with the following stack trace:
  
  Thread "server.startup : 0" (00000011) has been active for
  702995 milliseconds and may be hung. There is/are 1 thread(s)
  in total in the server that may be hung.
   at java.util.LinkedList.contains(LinkedList.java:485)
   at java.util.AbstractSet.removeAll(AbstractSet.java:106)
   at com.lombardisoftware.server.core.GroupCore.
    processDeletedUserGroups(GroupCore.java:631)
   at com.lombardisoftware.server.core.GroupCore.
    getAllGroupsInternal(GroupCore.java:593)
   at com.lombardisoftware.server.core.GroupCore.
    getAllGroups(GroupCore.java:572)
  

Local fix

Problem summary

• While the server starts, IBM BPM synchronizes all group
  definitions between the applied user registry and the IBM BPM
  database. Before these updates take effect in the database, IBM
  BPM updates the set of groups already available in the database
  by removing entries from the set of groups retrieved from the
  applied user registry. Because a Java core function is used that
  performs very slowly, Java threads might hang if the number of
  retrieved groups is greater than the number of groups already
  available in the database and both the number of already
  available groups and the retrieved groups is very large, such as
  more than 50 thousand entries.
  

Problem conclusion

• A fix is available for IBM BPM V7.5.1.2 that ensures even large
  existing group definitions are processed efficiently by using a
  different group-removal procedure. This procedure ensures the
  processing time is linear depending on the number of group
  entities.
  
  On Fix Central (http://www.ibm.com/support/fixcentral), search
  for JR53918:
  
  1. Select IBM Business Process Manager with your edition from
    the product selector, the installed version to the fix pack
    level, and your platform, and then click Continue.
  
  2. Select APAR or SPR, enter JR53918, and click Continue.
  
  When you download fix packages, ensure that you also download
  the readme file for each fix. Review each readme file for
  additional installation instructions and information about the
  fix.
  

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