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IC58543: WEBSPHERE MQ VERSION 7 JAVA AND JMS CLIENTS DO NOT ALWAYS SHARE CONNECTIONS

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APAR status

  • Closed as program error.

Error description

  • WebSphere MQ Version 7 Java and Java Message Service (JMS)
    clients configured to share channel connections may not share
    the same connection if multiple connection attempts are
    attempted concurrently. This can result in multiple channel
    connections with a low conversation count.
    
    Also, if shared connections are being created and closed at the
    same time, it is possible that a connection attempt will return
    with either a 2009 (MQRC_CONNECTION_BROKEN) or 2059
    (MQRC_Q_MGR_NOT_AVAILABLE) error.
    

Local fix

Problem summary

  • ****************************************************************
    USERS AFFECTED:
    This issue affects WebSphere MQ Version 7 Java and JMS users
    who utilise shared connections.
    
    Platforms affected:
    All Distributed (iSeries, all Unix and Windows) +Java
    ****************************************************************
    PROBLEM SUMMARY:
    There is a small timing window when a connection is created
    where it is not available to be shared. This results in the
    second connection attempt ignoring the connection in the process
    of being established, and could result in a new channel
    connection being created.
    
    A similar problem exists when connections are being closed. If a
    new connection attempt is made when the final conversation is
    being closed on a connection, it is possible that the channel
    connection is closed before the new connection attempt
    completes.
    

Problem conclusion

  • The connection sharing code has been updated to wait for
    any "in-progress" connection attempt to complete, if no other
    connection is suitable for sharing.
    
    A similar change has been made to the connection close code to
    wait if the last conversation is being closed, and there is a
    connection attempt in progress.
    
    ---------------------------------------------------------------
    The fix is targeted for delivery in the following PTFs:
    
                       v7.0
    Platform           Fix Pack 7.0.0.1
    --------           --------------------
    Windows            U200301
    AIX                U821414
    HP-UX (PA-RISC)    U820765
    HP-UX (Itanium)    U821296
    Solaris (SPARC)    U820766
    Solaris (x86-64)   U820880
    iSeries            tbc_p700_0_0_1
    Linux (x86)        U821407
    Linux (x86-64)     U821295
    Linux (zSeries)    U821294
    Linux (Power)      U820881
    
    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

    IC58543

  • Reported component name

    WMQ WINDOWS V7

  • Reported component ID

    5724H7220

  • Reported release

    700

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2008-10-17

  • Closed date

    2008-10-31

  • Last modified date

    2009-03-10

  • 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

  • R700 PSY

       UP

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Document Information

Modified date:
10 March 2009