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IC79037: MQ V7.0.1: XMS .NET CLIENT APPLICATION EXPERIENCES SLOW PUB/SUB MSG PROCESSING DURING HIGH TRAFFIC LOAD TO A MQ V6 QMGR

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APAR status

  • Closed as program error.

Error description

  • End user application running Message Service Client for .NET
    v2.0 (XMS .NET) doing pub/sub to a topic on a remote WebSphere
    MQ (WMQ) v6 queue manager experiences slow publishing. The
    condition occurs during heavy load periods and no errors are
    produced at the remote queue manager.
    

Local fix

Problem summary

  • ****************************************************************
    USERS AFFECTED:
    WebSphere MQ V7 .NET client applications users.
    
    Platforms affected:
    Windows
    
    ****************************************************************
    PROBLEM SUMMARY:
    There is long delay seen during the phase when a connection is
    established when several threads make simultaneous connection
    requests.
    
    A connection pool is maintained and the pooled connections are
    verified to see if a existing socket can accommodate the new
    connection request. An existing connection in the pool can
    accommodate the new connection request if that has not reached
    the maximum sharing conversation number and if the connection
    details matches. The time spent in matching the connection
    details multiplies with the increase in the number of active
    connections. This results in the contention for acquiring a
    lock on the connection pool and hence, results in long delays.
    

Problem conclusion

  • The code is modified so that we reorder the checks that are
    made while searching in the pooled connections. If the
    connection has already reached the maximum sharing conversation
    number then we need not perform other checks which compares the
    connection attributes. For example: if the client is connecting
    to a version 6 queue manager then there is no need to verify the
    pooled connection with the intention to reuse it. This reduces
    the delay to a large extent during the connection establishment
    phase.
    
    ---------------------------------------------------------------
    The fix is targeted for delivery in the following PTFs:
    
                       v7.0
    Platform           Fix Pack 7.0.1.8
    --------           --------------------
    Windows            U200335
    
    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

    IC79037

  • Reported component name

    WMQ WINDOWS V7

  • Reported component ID

    5724H7220

  • Reported release

    701

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2011-10-05

  • Closed date

    2012-01-20

  • Last modified date

    2012-01-20

  • 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

    WMQ WINDOWS V7

  • Fixed component ID

    5724H7220

Applicable component levels

  • R701 PSY

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Document Information

Modified date:
20 January 2012