JR53730: IF MULTIPLE TIMERS ARE SCHEDULED TO FIRE AT THE SAME TIME, NOT ALL THE TIMERS FIRE AS SCHEDULED DUE TO DB LOCK CONTENTION

bpm.8560.cf1.delta.repository.2
bpm.8560.cf1.delta.repository.1
8.5.6.0-WS-BPM-IFJR53730
8.5.5.0-WS-BPM-IFJR53730
Version 8.5 Refresh Pack 7 for the IBM Business Process Manager products

APAR status

• Closed as program error.

Error description

• If there are many Event Manager tasks scheduled for the  same
  second, deadlock exceptions might occur in clustered
  environments. These exceptions could lead to scheduled Event
  Manager tasks not running although their timers are due.
  You might see a stack trace that is similar to the following
  stack trace:
  
  DB2 SQL Error: SQLCODE=-911, SQLSTATE=40001, SQLERRMC=2,
  DRIVER=4.13.80; nested exception is
  com.ibm.db2.jcc.am.SqlTransactionRollbackException: DB2 SQL
  Error: SQLCODE=-911, SQLSTATE=40001, SQLERRMC=2, DRIVER=4.13.80
   at org.springframework.jdbc.support.
    SQLExceptionSubclassTranslator.translate
    (SQLExceptionSubclassTranslator.java:52)
   at org.springframework.jdbc.support.
    SQLErrorCodeSQLExceptionTranslator.translate
    (SQLErrorCodeSQLExceptionTranslator.java:237)
   at org.springframework.jdbc.core.JdbcTemplate.execute
    (JdbcTemplate.java:607)
   at org.springframework.jdbc.core.JdbcTemplate.query
    (JdbcTemplate.java:641)
   at org.springframework.jdbc.core.JdbcTemplate.query
    (JdbcTemplate.java:670)
   at org.springframework.jdbc.core.JdbcTemplate.query
    (JdbcTemplate.java:678)
   at com.lombardisoftware.server.scheduler.Engine.
    loadTasksIfOwnerInternal(Engine.java:1475)
   at com.lombardisoftware.server.scheduler.Engine.
    access$1700(Engine.java:103)
   at com.lombardisoftware.server.scheduler.Engine$12.
    doInTransaction(Engine.java:1347)
   at com.lombardisoftware.server.scheduler.Engine$12.
    doInTransaction(Engine.java:1344)
   at com.lombardisoftware.server.core.TXCommand$2.call
    (TXCommand.java:85)
   at com.lombardisoftware.utility.spring.
    ProgrammaticTransactionSupport$1.doInTransaction
    (ProgrammaticTransactionSupport.java:451)
   at org.springframework.transaction.jta.
    WebSphereUowTransactionManager$UOWActionAdapter.run
    (WebSphereUowTransactionManager.java:306)
   at com.ibm.ws.uow.embeddable.EmbeddableUOWManagerImpl.
    runUnderNewUOW(EmbeddableUOWManagerImpl.java:791)
   at com.ibm.ws.uow.embeddable.EmbeddableUOWManagerImpl.
    runUnderUOW(EmbeddableUOWManagerImpl.java:370)
   at org.springframework.transaction.jta.
    WebSphereUowTransactionManager.
    execute(WebSphereUowTransactionManager.java:252)
   at com.lombardisoftware.utility.spring.
    ProgrammaticTransactionSupport.executeInNewTransaction
    (ProgrammaticTransactionSupport.java:445)
   at com.lombardisoftware.utility.spring.
    ProgrammaticTransactionSupport.execute
    (ProgrammaticTransactionSupport.java:306)
   at com.lombardisoftware.server.core.TXCommand.
    executeInDeadlockRetryLoop(TXCommand.java:83)
   at com.lombardisoftware.server.scheduler.Engine.
    loadTasksIfOwner(Engine.java:1344)
   at com.lombardisoftware.server.scheduler.Engine.executeTasks
    (Engine.java:529)
  

Local fix

• Stop and restart the AppTarget cluster.
  

Problem summary

• This issue occurs wherever a problem with the database occurs
  while the Event Manager acquires and tries to load Event Manager
  tasks.
  

Problem conclusion

• A fix is/will be available for IBM BPM that prevents the
  deadlock.
  
  On Fix Central (http://www.ibm.com/support/fixcentral), search
  for JR53730:
  
  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 JR53730, 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

• Not applicable
  

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

• R855 PSY

     UP

• R856 PSY

     UP