IBM Support

IC96408: WEBSPHERE MQ V7 CHANNEL STARTUP IS DELAYED WHEN THE INBOUND CHANNEL REQUEST IS MADE.

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APAR status

  • Closed as program error.

Error description

  • WebSphere MQ V7 channel is delaying on its start when an
    inbound channel request comes in. After the delayed start the
    rest of the communication works fine.
    
    There are no errors in the MQ logs, only a successful channel
    start message.
    

Local fix

Problem summary

  • ****************************************************************
    USERS AFFECTED:
    Users of MQ 7.1 and 7.5 on Windows.
    
    Platforms affected:
    Windows
    
    ****************************************************************
    PROBLEM SUMMARY:
    Later versions of MQ was performing a reverse DNS lookup at
    channel start to get the hostname information to print in error
    logs if an error is encountered during communication. In case of
    MQ 701 this lookup was performed only during error condition.
    
    Presence of firewalls could make this calls expensive and hence
    delays were encountered during channel start in such cases.
    

Problem conclusion

  • The reverse DNS lookup calls were moved down the code to be made
    only when an error is encountered instead of being called at all
    times at the start of communication. These lookup was performed
    just to print them to error logs during error.
    
    ---------------------------------------------------------------
    The fix is targeted for delivery in the following PTFs:
    
    Version    Maintenance Level
    v7.1       7.1.0.7
    v7.5       7.5.0.4
    
    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

    IC96408

  • Reported component name

    WMQ WINDOWS V7

  • Reported component ID

    5724H7220

  • Reported release

    710

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2013-09-27

  • Closed date

    2014-01-20

  • Last modified date

    2014-10-28

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

    IC94458

  • 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

  • R710 PSY

       UP

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Document Information

Modified date:
28 October 2014