APAR status
Closed as program error.
Error description
XA transactions generated by WebSphere Application Server can be handled slowly by the IBM MQ queue manager.
Local fix
Problem summary
**************************************************************** USERS AFFECTED: Users of IBM MQ queue managers that participate in XA transactions managed by WebSphere Application Server. Platforms affected: AIX, HP-UX Itanium, Linux on Power, Linux on S390, Linux on x86, Linux on x86-64, Solaris SPARC, Linux on zSeries, Solaris x86-64, Windows, HP-UX PA-RISC **************************************************************** PROBLEM DESCRIPTION: IBM MQ uses a hashing algorithm to reduce the length of lists of transactions within the queue manager. The algorithm was not adequate to deal with the XIDs generated by WebSphere Application Server. The hashing algorithm did not distinguish adequately between these XIDs, so they all appeared in the same list as all other WAS-originated XIDs. Lookups within this list became relatively slow, leading to slow queue manager performance for operations on transactions.
Problem conclusion
The algorithm has been changed to deal successfully with the XIDs generated by WebSphere Application Server, to improve the performance of these transactions. --------------------------------------------------------------- The fix is targeted for delivery in the following PTFs: Version Maintenance Level v7.0 7.0.1.14 v7.1 7.1.0.7 v7.5 7.5.0.6 v8.0 8.0.0.3 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
IT05491
Reported component name
WMQ WINDOWS V7
Reported component ID
5724H7220
Reported release
701
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt
Submitted date
2014-11-11
Closed date
2015-03-13
Last modified date
2015-03-13
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 WINDOWS V7
Fixed component ID
5724H7220
Applicable component levels
R701 PSY
UP
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Document Information
Modified date:
31 March 2023