PI19926: WMQ 701: MQSERIES AND IMS. RESOLVE INDOUBT EXIT PROCESSING DID NOT BACKOUT A UNIT OF WORK

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• Mqseries with IMS Adapter with Trigger Monitor (BMP).
  
  Transaction goes into a loop condition, and it is then abended.
  Backout processing is running IMS DFSNDMX0 User exit
  and IMS invoked MQ's resolve indoubt exit, CSQQRESV.
  
  The MQ exit did not backout the unit of work as it was not
  currently indoubt but would have returned to IMS with R15 set to
  0.
  
  As a consequence IMS DFSNDMX0 causes the Abended transaction to
  be re-enqueued .
  MQGET triggered by the re-enqueuing is ending with RC2033 as MQ
  has not yet backed out the message.
  
  Only when the TCB on which the transaction was running went
  through EOT processing the MQ backout processing undid the
  MQGET and the message was made available again.
  

Local fix

• na
  

Problem summary

• ****************************************************************
  * USERS AFFECTED: All users of WebSphere MQ for z/OS Version 7 *
  *                 Release 0 Modification 1 and Release 1       *
  *                 Modification 0                               *
  ****************************************************************
  * PROBLEM DESCRIPTION: An MQ message may not be backed out     *
  *                      when an IMS transaction fails until the *
  *                      TCB has ended. RC=2033 may result if    *
  *                      transaction is retried when queue is    *
  *                      empty.                                  *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  If a transaction running on an IMS MPR does an MQGET and then
  subsequently fails, then the message is not backed out
  immediately. It will only be backed out when the TCB has itself
  gone through EOT processing.
  If the customer was using the IMS exit DFSNDMX0, the
  Non-Discardable Messages exit then the IMS transaction will be
  redriven and if the MQ queue is empty will result in RC=2033.
  

Problem conclusion

• CSQQRESV has been changed so that an in-flight UR will be backed
  out immediately.
  CSQ3EOT0 and CSQ3ID80 have been changed so that clean up is not
  done in EOT processing if primary EB has already been cleaned
  up.
  010Y
  100Y
  CSQQRESV
  CSQ3EOT0
  CSQ3ID80
  

Temporary fix

Comments

• ×**** PE15/06/25 FIX IN ERROR. SEE APAR PI43718  FOR DESCRIPTION
  

APAR Information

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

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

  PI33561 UI25050 UI25051

Modules/Macros

• CSQQRESV CSQ3EOT0 CSQ3ID80
  

Fix information

• Fixed component name

  WMQ Z/OS V7

• Fixed component ID

  5655R3600

Applicable component levels

• R010 PSY UI25050

     UP15/03/04 P F503

• R100 PSY UI25051

     UP15/03/04 P F503

Fix is available

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