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

Fixes are available

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":"BU059","label":"IBM Software w\/o TPS"},"Product":{"code":"SS7K4U","label":"WebSphere Application Server for z\/OS"},"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"850","Line of Business":{"code":"LOB45","label":"Automation"}}]

Document Information

Modified date:
03 May 2022

Tips

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

Fixes are available

Subscribe

APAR status

Closed as program error.

Error description

Local fix

Problem summary

Problem conclusion

Temporary fix

Comments

APAR Information

APAR number

Reported component name

Reported component ID

Reported release

Status

PE

HIPER

Special Attention

Submitted date

Closed date

Last modified date

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

Fixed component ID

Applicable component levels

R850 PSY

Document Information

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