IBM Support

IT29738: IBM MQ V9.1: Performance degradation when large number of subscriptions use selectors

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APAR status

  • Closed as program error.

Error description

  • In a scenario with a very large number (hundreds) of subscribers
    on a topic using selectors which rarely match publications, a
    delay in publish time performance is observed.
    

Local fix

  • Reduce the use of selectors with subscriptions
    

Problem summary

  • ****************************************************************
    USERS AFFECTED:
    Users of MQ V9.1 who create hundreds of subscriptions to a topic
    when all those subscribers use selectors.
    
    
    Platforms affected:
    MultiPlatform
    
    ****************************************************************
    PROBLEM DESCRIPTION:
    In this scenario a logic error caused the queue manager to
    perform character conversion more often than necessary when
    matching a publication against subscribers that used message
    selectors.
    

Problem conclusion

  • The logic error has been fixed.
    
    ---------------------------------------------------------------
    The fix is targeted for delivery in the following PTFs:
    
    Version    Maintenance Level
    v9.1 CD    9.1.4
    v9.1 LTS   9.1.0.4
    
    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

    IT29738

  • Reported component name

    IBM MQ BASE MP

  • Reported component ID

    5724H7271

  • Reported release

    910

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2019-07-15

  • Closed date

    2019-08-19

  • Last modified date

    2019-08-19

  • 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

    5724H7271

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":"910","Edition":"","Line of Business":{"code":"LOB45","label":"Automation"}}]

Document Information

Modified date:
19 August 2019