IBM Support

PI54881: THREADS BEING ALLOCATED TO ACCESS AN MDB THAT HAS ALREADY REACHED MAX SESSIONS.

Fixes are available

8.5.5.10: WebSphere Application Server V8.5.5 Fix Pack 10
9.0.0.1: WebSphere Application Server traditional V9.0 Fix Pack 1
9.0.0.2: WebSphere Application Server traditional V9.0 Fix Pack 2
8.5.5.11: WebSphere Application Server V8.5.5 Fix Pack 11
9.0.0.3: WebSphere Application Server traditional V9.0 Fix Pack 3
9.0.0.4: WebSphere Application Server traditional V9.0 Fix Pack 4
8.5.5.12: WebSphere Application Server V8.5.5 Fix Pack 12
9.0.0.5: WebSphere Application Server traditional V9.0 Fix Pack 5
9.0.0.6: WebSphere Application Server traditional V9.0 Fix Pack 6
8.5.5.13: WebSphere Application Server V8.5.5 Fix Pack 13
9.0.0.7: WebSphere Application Server traditional V9.0 Fix Pack 7
9.0.0.8: WebSphere Application Server traditional V9.0 Fix Pack 8
8.5.5.14: WebSphere Application Server V8.5.5 Fix Pack 14
9.0.0.9: WebSphere Application Server traditional V9.0 Fix Pack 9
9.0.0.10: WebSphere Application Server traditional V9.0 Fix Pack 10
8.5.5.15: WebSphere Application Server V8.5.5 Fix Pack 15
9.0.0.11: WebSphere Application Server traditional V9.0 Fix Pack 11
9.0.5.0: WebSphere Application Server traditional Version 9.0.5 Refresh Pack
9.0.5.1: WebSphere Application Server traditional Version 9.0.5 Fix Pack 1
9.0.5.2: WebSphere Application Server traditional Version 9.0.5 Fix Pack 2
8.5.5.17: WebSphere Application Server V8.5.5 Fix Pack 17
9.0.5.3: WebSphere Application Server traditional Version 9.0.5 Fix Pack 3
9.0.5.4: WebSphere Application Server traditional Version 9.0.5 Fix Pack 4
9.0.5.5: WebSphere Application Server traditional Version 9.0.5 Fix Pack 5
9.0.5.6: WebSphere Application Server traditional Version 9.0.5 Fix Pack 6

Subscribe

You can track all active APARs for this component.

 

APAR status

  • Closed as program error.

Error description

  • Unexpected behaviour is due to the CRA resubmitting work to the
    SR to process message references even though there are already
    outstanding requests in the SR to procress the same message
    references.
    
    APAR to address the issue of inflight work in the SR being
    resubmitted by the CRA to the SR if redriven by the QMGR
    MARKINT timing out.
    

Local fix

Problem summary

  • ****************************************************************
    * USERS AFFECTED:  WebSphere Application Server users of WMQ   *
    *                  Activation Specifications.                  *
    ****************************************************************
    * PROBLEM DESCRIPTION: The WMQ Activation Spec may duplicate   *
    *                      work to process the same message when   *
    *                      the message mark browse interval        *
    *                      expires.                                *
    ****************************************************************
    * RECOMMENDATION:                                              *
    ****************************************************************
    If the message mark browse interval (MARKINT) on the Queue
    Manager expires the message will be redelivered to the WMQ
    Activation Specification in the control region adjunct
    process.  The current behaviour of the activation specification
    is to resubmit a new work request to a servant region to
    process the message regardless of whether an existing request
    to process the same message is already in progress.
    Furthermore, if such an outstanding request existed then the
    resubmission of the new work is not subject to the throttling
    constraints configured for the activation specification.
    

Problem conclusion

  • An alternative behaviour has been provided such that in the
    event that a message reference is redelivered to the WMQ
    Activation Specification and work is already outstanding to
    process the same message reference then the redelivery is
    ignored and no new work is dispatched to the servant regions.
    
    The existing behaviour remains the default.  To enable the
    new behaviour JVM system property
    com.ibm.ws.wmqra.zdispatcher.ActivationSpecRedispatchInflightMes
    sages should be specified with a value of false
    
    APAR PI54881 is currently targeted for inclusion in Fix Packs
    8.5.5.10 and 9.0.0.1 of WebSphere Application Server.
    
    Please refer to the Recommended Updates page for delivery
    information:
    http://www.ibm.com/support/docview.wss?rs=180&uid=swg27004980
    
    In addition, please refer to URL:
    http://www.ibm.com/support/docview.wss?rs=404&uid=swg27006970
    for Fix Pack PTF information.
    

Temporary fix

  • The message mark browse interval (MARKINT) configured for the
    Queue Manager can be increased.
    

Comments

APAR Information

  • APAR number

    PI54881

  • Reported component name

    WEBSPHERE FOR Z

  • Reported component ID

    5655I3500

  • Reported release

    850

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2016-01-05

  • Closed date

    2016-07-11

  • Last modified date

    2016-07-11

  • 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

    WEBSPHERE FOR Z

  • Fixed component ID

    5655I3500

Applicable component levels

  • R850 PSY

       UP

[{"Business Unit":{"code":"BU053","label":"Cloud \u0026 Data Platform"},"Product":{"code":"SS7K4U","label":"WebSphere Application Server for z\/OS"},"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"850","Line of Business":{"code":"LOB36","label":"IBM Automation"}}]

Document Information

Modified date:
17 October 2021