IBM Support

IT23220: Once per hour MQPUT or MQOPEN for cluster queues can be slower than usual

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APAR status

  • Closed as program error.

Error description

  • The MQ cluster cache is maintained approximately once per hour
    on each queue manager that participates in a cluster or
    clusters.
    
    During this time the local queue manager's cache cannot be
    queried by
    - MQOPEN calls that specify MQOO_BIND_ON_OPEN, or
    - MQPUT calls where the object handle was opened earlier by
    MQOPEN specifying MQOO_BIND_NOT_FIXED.
    
    In large scale environments (thousands of local or remote
    clustered queues known to the local queue manager, thousands of
    connected applications performing lookups) the hourly task was
    taking a few seconds, causing the above calls to wait, up to a
    few seconds.
    

Local fix

Problem summary

  • ****************************************************************
    USERS AFFECTED:
    Users with thousands of cluster queues (locally or remotely
    defined) and thousands of connected applications on the local
    queue manager.
    
    
    Platforms affected:
    MultiPlatform
    
    ****************************************************************
    PROBLEM DESCRIPTION:
    There was an inefficiency in the algorithm that was checking
    whether memory areas could be freed.
    

Problem conclusion

  • The inefficiency has been removed. In testing, a maintenance
    cycle that previously took ten seconds now completes in less
    than one second after the application of this change.
    
    ---------------------------------------------------------------
    The fix is targeted for delivery in the following PTFs:
    
    Version    Maintenance Level
    v7.5       7.5.0.9
    v8.0       8.0.0.10
    v9.0 LTS   9.0.0.5
    
    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

    IT23220

  • Reported component name

    IBM MQ BASE MP

  • Reported component ID

    5724H7251

  • Reported release

    800

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2017-11-20

  • Closed date

    2018-04-12

  • Last modified date

    2018-05-09

  • APAR is sysrouted FROM one or more of the following:

  • APAR is sysrouted TO one or more of the following:

    PI96655

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:
09 May 2018