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IT27810: Window for message loss or duplication if sender channel disconnects and reconnects during commit processing

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APAR status

  • Closed as program error.

Error description

  • A small timing window exists with the potential for message loss
    or duplication if sender channel disconnects abnormally and
    reconnects during commit processing, for example due to network
    disruption or a forceful termination of the sender channel
    process.
    

Local fix

Problem summary

  • ****************************************************************
    USERS AFFECTED:
    Users sending persistent messages, or non-persistent messages
    with NPMSPEED(NORMAL) on a channel between two queue managers
    are potentially affected.
    
    
    Platforms affected:
    MultiPlatform
    
    ****************************************************************
    PROBLEM DESCRIPTION:
    A timing condition exists where an abnormal termination of a
    channel and subsequent channel retry could lead to loss of
    integrity to the transaction used to move a batch of messages
    from the transmission queue on one queue manager to the target
    queue manager, as a consequence messages in a batch could be
    lost or duplicated.
    

Problem conclusion

  • Logic has been added to channels to ensure that the internal
    resources that are used to track the transaction used to
    transfer a batch of messages maintain consistency.
    
    ---------------------------------------------------------------
    The fix is targeted for delivery in the following PTFs:
    
    Version    Maintenance Level
    v8.0       8.0.0.12
    v9.0 LTS   9.0.0.6
    v9.1 CD    9.1.2
    v9.1 LTS   9.1.0.2
    
    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

    IT27810

  • 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

    2019-01-18

  • Closed date

    2019-03-27

  • Last modified date

    2019-04-02

  • 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

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

Document Information

Modified date:
02 April 2019