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IT15913: Queue manager becomes unresponsive error log reports AMQ7463 queue manager log is full

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You can track all active APARs for this component.

 

APAR status

  • Closed as program error.

Error description

  • The queue manager is unresponsive to runmqsc commands and is
    unable to process messages.
    
    An FDC is generated with the following information:
    
    Probe Id          :- HL010004
    Component         :- hlgReserveLogSpace
    Program Name      :- amqzlaa0
    Major Errorcode   :- hrcE_LOG_FULL
    Probe Description :- AMQ6709: The log for the queue manager is
    full.
    .
    MQM Function Stack
    zlaMainThread
    zlaProcessMessage
    zlaProcessMQIRequest
    zlaMQPUT
    zsqMQPUT
    kpiMQPUT
    kqiPutIt
    kqiPutMsgSegments
    apiPutMessage
    aqmPutMessage
    aqhPutMessage
    aqqWriteMsg
    aqqWriteMsgData
    aqlReservePutSpace
    almReserveSpace
    hlgReserveLogSpace
    xcsFFST
    
    
    The Queue manager error log reports:
    
    AMQ7463: The log for queue manager 'QueueManagerName' is full.
    
    After the queue manager is forcibly shut down, the queue
    manager starts but takes an unexpectedly long time to replay
    the queue manager transaction log records.
    
    No explanation for this slowdown is observed in the MQ error
    logs or FDC files prior to the AMQ6709 message being issued.
    

Local fix

Problem summary

  • ****************************************************************
    USERS AFFECTED:
    Users of IBM MQ version 8 or 9
    
    
    Platforms affected:
    MultiPlatform
    
    ****************************************************************
    PROBLEM DESCRIPTION:
    The amqzmuc0 MQ process performs checkpoint processing activity
    to ensure efficient space utiliztation of the log. If this
    thread hangs, the transaction log fills. The time it takes to
    fill depends on the log size and transaction workload, but
    without the checkpoint process, it will eventually fill and the
    queue manager will stop.
    
    If this happens an FDC is produced with the following
    characteristics:
    Major Errorcode   :- hrcE_LOG_FULL
    Probe Description :- AMQ6709: The log for the queue manager is
    full.
    
    MQ is designed to monitor the health of the checkpoint process,
    however a coding error meant that this monitoring was not
    performing correctly, and as such no warning was issued to the
    user that the checkpoint process had terminated prior to the log
    becoming full.
    

Problem conclusion

  • The MQ queue manager code has been updated to correctly monitor
    the health of the checkpoint process. If no activity from the
    checkpoint process is observed for a period of 5 minutes, then
    an FDC will be cut with the following expected characteristics:
    
    	Probe Id          :- AD163010
    	Major Errorcode   :- MQRC_UNEXPECTED_ERROR
    	Probe Description :- AMQ6125: An internal WebSphere MQ
    error has occurred.
    	Comment1          :- Unexpected delay in checkpoint thread
    
    The error log will also include an entry:
    	AMQ6125: An internal WebSphere MQ error has occurred.
    
    If this FDC is seen from a running queue manager, the queue
    manager should be quiesced and restarted in order to restart the
    checkpoint process.
    
    ---------------------------------------------------------------
    The fix is targeted for delivery in the following PTFs:
    
    Version    Maintenance Level
    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

    IT15913

  • 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

    2016-06-28

  • Closed date

    2016-07-19

  • Last modified date

    2017-06-01

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

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

Fix information

  • Fixed component name

    WMQ BASE MULTIP

  • Fixed component ID

    5724H7251

Applicable component levels

  • R800 PSY

       UP

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Document Information

Modified date:
01 June 2017