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PI69996: WHEN IBM MQ V8 GENERATES AMQ9469 CLUSTER MESSAGES, FDC FILES ARECREATED THAT DUMP THE CLUSTER CACHE LEADING TO LARGE FDCS

A fix is available

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APAR status

  • Closed as program error.

Error description

  • IBM MQ V8 generates large FDCs with Probe Id RM191020 for the
    repository manager process (amqrrmfa)
    The FDCs are generated along with the reported AMQ9469 error
    message in the queue manager logs.
    They contain a full dump of the entire cached queue manager
    cluster configuration and can be numerous.
    As a result they can consume large  amounts of disk space.
    Examples:
    
    AMQ9469: Update not received for CLUSRCVR channel TO.QM1
    hosted on queue manager QM1_2016-01-01_11.11.11 in cluster
    CLUSTER1.
    
    EXPLANATION:
    The repository manager detected that the CLUSRCVR channel
    has not been re-published by its owning queue manager. This
    re-publish action should have happened automatically 4 days
    ago, or in the time between then and now.
    
    See the knowledge center for the full error message:
    
    http://www.ibm.com/support/knowledgecenter/en/SSFKSJ_8.0.0/com.i
    bm.mq.ref.doc/amq9.htm
    
        The FDC will show the following:
    
    Probe Id          :- RM191020
    Component         :- rrmMaintainClqMgr
    Program Name      :- amqrrmfa
    Thread            :- 1    Repository
    Probe Type        :- INCORROUT
    Probe Description :- AMQ6125: An internal WebSphere MQ error
    has occurred.
    Comment1          :- Repeated occurrences of AMQ9469
    
    MQM Function Stack
    amqrrfma_main
    rrmMain
    rrmRepository
    rrmGetMsg
    rrmRunTimers
    rrmMaintenance
    rfxEnumCLQMGR
    rrmMaintainClqMgr
    xcsFFST
    

Local fix

  • The following environment variables can be exported to reduce
    the size of the FDCs being generated. The queue manager will
    need to be restarted after they are in place.
    .
    Unix:
      export AMQ_RRMFA_MSG_HISTORY=0
      export AMQ_RRMFA_SUPPRESS_CACHEDUMP=1
    Windows:
      set AMQ_RRMFA_MSG_HISTORY=0
      set AMQ_RRMFA_SUPPRESS_CACHEDUMP=1
    .
    

Problem summary

  • ****************************************************************
    * USERS AFFECTED: All users of WebSphere MQ for z/OS Version 8 *
    *                 Release 0 Modification 0.                    *
    ****************************************************************
    * PROBLEM DESCRIPTION: When CSQX469E messages are put out      *
    *                      repeatedly, FFSTs are produced. These   *
    *                      are shown with a CSQX053E message being *
    *                      produced, and the FFST information      *
    *                      being written to CSQXSNAP.              *
    ****************************************************************
    * RECOMMENDATION:                                              *
    ****************************************************************
    Message CSQX469E is produced when a CLUSRCVR channel has not
    been republished to the full repositories within a cluster.
    However, if this message is still being produced, such as in the
    cases it is known and expected, FFSTs will be issued 30 days
    into the grace period. The FFST written to CSQXSNAP will contain
    'Repeated CSQX469E'.
    

Problem conclusion

  • The FFSTs in this case have been removed, and will no longer be
    produced for this scenario.
    000Y
    CMQXRMNT
    

Temporary fix

Comments

APAR Information

  • APAR number

    PI69996

  • Reported component name

    WMQ Z/OS 8

  • Reported component ID

    5655W9700

  • Reported release

    000

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2016-09-30

  • Closed date

    2016-10-28

  • Last modified date

    2016-12-01

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

    IT15584

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

    PI70594 UI42115

Modules/Macros

  • CMQXRMNT
    

Fix information

  • Fixed component name

    WMQ Z/OS 8

  • Fixed component ID

    5655W9700

Applicable component levels

  • R000 PSY UI42115

       UP16/11/26 P F611

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:
01 December 2016