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

A fix is available

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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 number

    PI53813

  • Reported component name

    WMQ Z/OS V7

  • Reported component ID

    5655R3600

  • Reported release

    100

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    YesHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2015-12-09

  • Closed date

    2016-02-11

  • Last modified date

    2016-04-05

  • 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

  • Select the PTF appropriate for your component level. You will be required to sign in. Distribution on physical media is not available in all countries.

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Document Information

Modified date:
05 April 2016