PJ40791: SINCE UPDATE TO EPROCESS 5.2.0-002, COMPONENT MANAGER PROCESSES SOME OPERATIONS TWICE.

APAR status

• Closed as program error.

Error description

• Using Component Manager (CM) with multiple threads, users notice
  that work items get processed more than once.
  
  In some particular cases, the Component Manager threads are
  having the same work item (assuming with lock) at the same time,
  so they both process the same work item.
  Depending on how the task is defined and how fast it runs,
  eventually one thread finishes its task and another thread is
  still able to process the work item hence CM operation executed
  twice.
  
  This problem only happens when multiple threads are configured.
  And only
  with Event Port configured (as all threads will get notified at
  the same time when a new work item arrived in the CM Queue).
  This problem only happens with SQL Server 2008 and later.  Using
  SQL Server 2000 and 2005, this
  situation will not occur.
  
  The problem is with SELECT.  Given only one WobId arriving in
  the component queue, more than one thread will get the same
  WobId with lock.
  
  The work-around for now is to use single-thread.  With
  single-thread, you will not encounter this problem.
  or if you use multiple-threads do not configure the Event Port.
  There is a small chance (rare) you will get this issue w/o using
  the
  Event Port.
  

Local fix

• Configure the CM to use a single-thread.  With
  single-thread, you will not encounter this problem.
  If you use multiple-threads do not configure the Event Port.
  

Problem summary

• ****************************************************************
  * USERS AFFECTED:                                              *
  * 4.5.1 PE users                                               *
  ****************************************************************
  * PROBLEM DESCRIPTION:                                         *
  * See Error Description                                        *
  ****************************************************************
  * RECOMMENDATION:                                              *
  * Apply 4.5.1.4-P8PE-FP004 or newer.                           *
  ****************************************************************
  

Problem conclusion

• Fixed in 4.5.1.4-P8PE-FP004 and newer.
  

Temporary fix

Comments

APAR Information

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

  PJ40789

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

Fix information

• Fixed component name

  PROCESS ENGINE

• Fixed component ID

  5724R7607

Applicable component levels

• R451 PSY

     UP