PI53813: IN THE CHIN SNAP DUMP, THE CUSTOMER SEES A PSIPROCESSPROXYSUBS.

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• In the CHIN snap dump, the customer sees a
  psiProcessProxySubs.
  .
  | psiProcessProxySubs............. |
  | ........                         |
  | ....                             |
  | X...XINS........psiGetMsg....... |
  | ................................ |
  | ................QT95             |
  |                                  |
  .
  The FFST is caused by the high queue
  depth.  It is issued when psiProcessProxySubs
  fails to get a message from the fanreq queue
  due to hitting the MAXUMSGS
  (maximum number of puts/gets in a unit of work).
  .
  
  Additional Symptom(s) Search Keyword(s):
  CSQX053E CSQSNAP publish subscribe pub sub pubsub
  XFFSpsiProcessProxySubs psiGetMsg
  SYSTEM.INTER.QMGR.FANREQ depth curdepth
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All users of WebSphere MQ for z/OS Version 7 *
  *                 Release 1 Modification 0.                    *
  ****************************************************************
  * PROBLEM DESCRIPTION: CSQX053E is issued reporting Error      *
  *                      information in the CSQSNAP DD during    *
  *                      channel initiator startup if the        *
  *                      number of messages on queue             *
  *                      SYSTEM.INTER.QMGR.FANREQ is greater     *
  *                      than MAXUMSGS.                          *
  *                      The FFST indicates the error occurred   *
  *                      in psiProcessProxySubs.                 *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  During channel initiator startup psiProcessProxySubs processes
  the messages on SYSTEM.INTER.QMGR.FANREQ to determine if any
  resynchronisation of proxy subscriptions is required due to
  changes to topics or subscriptions while the channel initiator
  was stopped.
  If the number of messages on this queue is greater than MAXUMSGS
  MQRC_SYNCPOINT_LIMIT_REACHED is returned when this routine
  attempts to get all of the required messages. This is not
  expected, and so the task reports the error and ends
  prematurely.
  No resynchronisation of proxy subscriptions takes place, and
  subsequent proxy subscription fanout requests are not processed.
  

Problem conclusion

• psiProcessProxySubs is changed to commit periodically while
  processing any messages on the queue at startup, preventing the
  syncpoint limit being reached.
  100Y
  CMQXZMUC
  

Temporary fix

• *********
  * HIPER *
  *********
  

Comments

APAR Information

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

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

  UI35289

Modules/Macros

• CMQXZMUC
  

Fix information

• Fixed component name

  WMQ Z/OS V7

• Fixed component ID

  5655R3600

Applicable component levels

• R100 PSY UI35289

     UP16/03/03 P F603 ¢

Fix is available

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