A fix is available
APAR status
Closed as program error.
Error description
Allocation locks on SYSTEM.ADMIN.PERFM.EVENT being leaked, when the queue is not defined as a local queue (the csutomer has redefined to be an alias queue). In this situation CSQMIARC obtains an allocation lock on the queue, but never releases it.
Local fix
n/a
Problem summary
**************************************************************** * USERS AFFECTED: All users of WebSphere MQ for z/OS Version 8 * * Release 0 Modification 0. * **************************************************************** * PROBLEM DESCRIPTION: Event message generation leaks * * allocation locks when the event queue * * is a non-local queue, leading to * * performance degradation. * **************************************************************** * RECOMMENDATION: * **************************************************************** When an event message is generated, a lock is obtained on the event queue name (for example SYSTEM.ADMIN.PERFM.EVENT, SYSTEM.ADMIN.QMGR.EVENT, depending on the type of event message being generated). If the event queue is a non-local queue (for example, it has been redefined as an alias queue, cluster queue or remote queue) this lock is not released when the event message has been put. The lock will remain held until the application generating the event message (e.g. batch application, channel initiator) disconnects from the queue manager. For long running applications, the number of these allocation duration locks being leaked can result in a build up of lock control blocks, resulting in performance degradation.
Problem conclusion
CSQMIARC is changed to correctly release the allocation lock after putting an event message to a non-local event queue. 000Y CSQMIARC
Temporary fix
********* * HIPER * *********
Comments
APAR Information
APAR number
PI67954
Reported component name
WMQ Z/OS 8
Reported component ID
5655W9700
Reported release
000
Status
CLOSED PER
PE
NoPE
HIPER
YesHIPER
Special Attention
NoSpecatt / Xsystem
Submitted date
2016-08-23
Closed date
2016-09-20
Last modified date
2016-11-02
APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:
PI68707 UI40885
Modules/Macros
CSQMIARC
Fix information
Fixed component name
WMQ Z/OS 8
Fixed component ID
5655W9700
Applicable component levels
R000 PSY UI40885
UP16/10/06 P F610 ¢
Fix is available
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Document Information
Modified date:
02 November 2016