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IV21986: Add AMQ_XA_ZOMBIE_EXPIRY environment variable

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You can track all active APARs for this component.

 

APAR status

  • Closed as program error.

Error description

  • Under certain circumstances a WebSphere MQ queue manager can
    retain information about XA transactions that is not removed
    until the queue manager is restarted. This can occur, for
    example, when an external XA Transaction Manager software
    product calls xa_end(TMFAIL) without a subsequent xa_rollback.
    This build up of transactions can result in decreased
    performance of XA calls and high CPU usage within the amqzlaa0
    processes.
    

Local fix

  • Restart the queue manager.
    

Problem summary

  • ****************************************************************
    USERS AFFECTED:
    Users with many XA transactions for which information has been
    retained.
    
    Platforms affected:
    All Distributed (iSeries, all Unix and Windows)
    ****************************************************************
    PROBLEM SUMMARY:
    The queue manager retains information about XA transactions that
    have been ended until they are committed or rolled back. If the
    external Transaction Manager software product does not commit or
    roll back the transaction then information is retained until the
    queue manager is restarted.
    

Problem conclusion

  • Support for an environment variable, AMQ_XA_ZOMBIE_EXPIRY, has
    been added that will allow transactions to be expired, allowing
    the retained information about the transaction to be removed.
    The environment variable should be used under the guidance of
    IBM support.
    
    ---------------------------------------------------------------
    The fix is targeted for delivery in the following PTFs:
    
    Version    Maintenance Level
    v7.0       7.0.1.10
    v7.1       7.1.0.2
    v7.5       7.5.0.3
    
    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

    IV21986

  • Reported component name

    WMQ AIX V7

  • Reported component ID

    5724H7221

  • Reported release

    701

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2012-05-30

  • Closed date

    2012-07-09

  • Last modified date

    2013-09-16

  • 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 AIX V7

  • Fixed component ID

    5724H7221

Applicable component levels

  • R701 PSY

       UP

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Document Information

Modified date:
16 September 2013