IBM Support

IT24593: Message may be discarded when using async consume to consume messages outside of syncpoint

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APAR status

  • Closed as program error.

Error description

  • When the IBM MQ V8 Client uses asynchronous consume to get
    messages outside syncpoint there is a timing window in
    which the callback can return MQRC_NO_MSG_AVAILABLE (RC=2033)
    without delivering a pending message.
    
    The problem is more likely to occur when the callback function
    takes longer than the gmo.WaitInterval to process the message.
    

Local fix

Problem summary

  • ****************************************************************
    USERS AFFECTED:
    Users using MQ client with asynchronous consume with MQGMO_WAIT
    and MQGMO_NO_SYNCPOINT options.
    
    
    Platforms affected:
    MultiPlatform
    
    ****************************************************************
    PROBLEM DESCRIPTION:
    An MQ client was retrieving messages asynchronously and
    de-registered the callback while a message was pending delivery.
    
    A defect in the MQ code caused the callback to return
    MQRC_NO_MSG_AVAILABLE (RC=2033) without delivering the pending
    message.
    

Problem conclusion

  • The defect has been fixed to ensure that pending message will be
    delivered.
    
    ---------------------------------------------------------------
    The fix is targeted for delivery in the following PTFs:
    
    Version    Maintenance Level
    v8.0       8.0.0.12
    v9.0 LTS   9.0.0.7
    
    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

    IT24593

  • Reported component name

    IBM MQ BASE MP

  • Reported component ID

    5724H7251

  • Reported release

    800

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    YesHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2018-04-02

  • Closed date

    2019-01-21

  • Last modified date

    2020-10-26

  • 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

    IBM MQ BASE MP

  • 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:
27 October 2020