Fixes are available
APAR status
Closed as program error.
Error description
Under certain circumstances a WebSphere MQ queue manager can retain information about XA transactions that is not removed until the queue manager is restarted. This can occur, for example, when an external XA Transaction Manager software product calls xa_end(TMFAIL) without a subsequent xa_rollback. This build up of transactions can result in decreased performance of XA calls and high CPU usage within the amqzlaa0 processes.
Local fix
Restart the queue manager.
Problem summary
**************************************************************** USERS AFFECTED: Users with many XA transactions for which information has been retained. Platforms affected: All Distributed (iSeries, all Unix and Windows) **************************************************************** PROBLEM SUMMARY: The queue manager retains information about XA transactions that have been ended until they are committed or rolled back. If the external Transaction Manager software product does not commit or roll back the transaction then information is retained until the queue manager is restarted.
Problem conclusion
Support for an environment variable, AMQ_XA_ZOMBIE_EXPIRY, has been added that will allow transactions to be expired, allowing the retained information about the transaction to be removed. The environment variable should be used under the guidance of IBM support. --------------------------------------------------------------- The fix is targeted for delivery in the following PTFs: Version Maintenance Level v7.0 7.0.1.10 v7.1 7.1.0.2 v7.5 7.5.0.3 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
IV21986
Reported component name
WMQ AIX V7
Reported component ID
5724H7221
Reported release
701
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt
Submitted date
2012-05-30
Closed date
2012-07-09
Last modified date
2013-09-16
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 AIX V7
Fixed component ID
5724H7221
Applicable component levels
R701 PSY
UP
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Document Information
Modified date:
31 March 2023