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IT15584: When MQ generates AMQ9469 cluster messages FDC files are created that dump the cluster cache leading

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You can track all active APARs for this component.

 

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:
    Users of Queue Manager Cluster configurations with have member
    queue managers that are unavailable for extended periods.
    
    
    Platforms affected:
    MultiPlatform
    
    ****************************************************************
    PROBLEM DESCRIPTION:
    The issue relating to the size of the FDCs is caused by a
    significant quantity of diagnostic information now added to
    every FDC produced by the repository manager process (amqrrmfa).
    In combination with FDCs which are generated frequently because
    of the nature of their state, this can cause rapid growth in the
    disk requirements for the error logging
    
    The problem was caused in this instance by a situation that a
    number of cluster objects were subject to. Specifically, a queue
    manager
    not in contact with the cluster for a significant period of
    time.
    

Problem conclusion

  • FDCs should be reserved to document unexpected circumstances
    that occur and nor reporting future events.
    The FDC has now been removed but the AMQ9469 error continues to
    be reported in the logs.
    This will preserve space where users might have many queue
    managers in an unavailable state for extended periods.
    
    ---------------------------------------------------------------
    The fix is targeted for delivery in the following PTFs:
    
    Version    Maintenance Level
    v7.5       7.5.0.9
    v8.0       8.0.0.6
    v9.0 CD    9.0.1
    v9.0 LTS   9.0.0.1
    
    The latest available maintenance can be obtained from
    'WebSphere MQ Recommended Fixes'
    http://www-1.ibm.com/support/docview.wss?rs=171&uid=swg27006037
    
    If the maintenance level is not yet available information on
    its planned availability can be found in 'WebSphere MQ
    Planned Maintenance Release Dates'
    http://www-1.ibm.com/support/docview.wss?rs=171&uid=swg27006309
    ---------------------------------------------------------------
    

Temporary fix

Comments

APAR Information

  • APAR number

    IT15584

  • Reported component name

    WMQ BASE MULTIP

  • Reported component ID

    5724H7251

  • Reported release

    800

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2016-06-03

  • Closed date

    2016-09-30

  • Last modified date

    2021-03-25

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

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

    PI69996 IT36358

Fix information

  • Fixed component name

    WMQ BASE MULTIP

  • Fixed component ID

    5724H7251

Applicable component levels

[{"Line of Business":{"code":"LOB36","label":"IBM Automation"},"Business Unit":{"code":"BU053","label":"Cloud & Data Platform"},"Product":{"code":"SSYHRD","label":"IBM MQ"},"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"8.0.0.0"}]

Document Information

Modified date:
26 March 2021