IBM Support

IT36755: Intermittent problem where a duplicate message id is generated by the queue manager.

Subscribe to this APAR

By subscribing, you receive periodic emails alerting you to the status of the APAR, along with a link to the fix after it becomes available. You can track this item individually or track all items by product.

Notify me when this APAR changes.

Notify me when an APAR for this component changes.

 

APAR status

  • Closed as program error.

Error description

  • Message IDs within MQ are expected to be unique. This APAR
    addresses a problem where a JMS consumer receiving messages
    from queues and topics intermittently receives duplicate message
    IDs under heavy load.
    

Local fix

Problem summary

  • ****************************************************************
    USERS AFFECTED:
    Those relying on unique message Ids across multiple queue and
    topics
    
    
    Platforms affected:
    MultiPlatform
    
    ****************************************************************
    PROBLEM DESCRIPTION:
    When applications were executed which concurrently put messages
    to both queues and topics, a defect in MQ code caused the queue
    manager to use the same message Id for multiple messages.
    

Problem conclusion

  • The MQ queue manager's message ID allocation logic has been
    correct to prevent this issue.
    
    ---------------------------------------------------------------
    The fix is targeted for delivery in the following PTFs:
    
    Version    Maintenance Level
    v9.0 LTS   9.0.0.13
    v9.1 LTS   9.1.0.12
    v9.2 LTS   9.2.0.6
    v9.x CD    9.3.0.0
    
    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

    IT36755

  • Reported component name

    IBM MQ BASE M/P

  • Reported component ID

    5724H7261

  • Reported release

    900

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2021-05-02

  • Closed date

    2022-03-17

  • Last modified date

    2022-04-13

  • 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 M/P

  • Fixed component ID

    5724H7261

Applicable component levels

[{"Line of Business":{"code":"LOB45","label":"Automation"},"Business Unit":{"code":"BU059","label":"IBM Software w\/o TPS"},"Product":{"code":"SSYHRD","label":"IBM MQ"},"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"9.0"}]

Document Information

Modified date:
14 April 2022