APAR status
Closed as program error.
Error description
When using extended message selection the users might observe message processing degradation and the following failure data capture (FDC) records indicating delays in acquiring and releasing RWMutex would be generated. 2020/07/07 01:31:54.302258+8 amqzlaa0 109858 1357 XC514090 xlsRWMutexRequest xecL_W_LONG_LOCK_WAIT 2020/07/07 01:31:55.310997+8 amqzlaa0 104638 3620 XC514090 xlsRWMutexRequest xecL_W_LONG_LOCK_WAIT 2020/07/07 01:32:08.412973+8 amqzlaa0 104638 3639 XC515091 xlsRWMutexRelease xecL_W_LONG_LOCK_WAIT 2020/07/07 01:32:08.691239+8 amqzlaa0 109706 2984 XC515091 xlsRWMutexRelease xecL_W_LONG_LOCK_WAIT
Local fix
Restart the queue manager
Problem summary
**************************************************************** USERS AFFECTED: Users using extended message selection with intermittent delays in MQ or broker processing the messages. One of the major reasons for delays could be high I/O latency(e.g. 30 seconds). Platforms affected: MultiPlatform **************************************************************** PROBLEM DESCRIPTION: MQ encountered message processing delays due to high I/O latency which also affected extended message selection(content filtering) performance. When the I/O latency improved MQ could not recover from the initial performance degradation and continue to process the message slowly. The current logic in extended message selection did not account for the initial slowness and this caused problem in recovery.
Problem conclusion
MQ code has been modified to recover from the initial slowness in message processing when using extended message selection. --------------------------------------------------------------- The fix is targeted for delivery in the following PTFs: Version Maintenance Level v8.0 8.0.0.16 v9.0 LTS 9.0.0.12 v9.1 LTS 9.1.0.8 v9.2 LTS 9.2.0.2 v9.x CD 9.2.2 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
IT33901
Reported component name
IBM MQ BASE MP
Reported component ID
5724H7271
Reported release
910
Status
CLOSED PER
PE
NoPE
HIPER
YesHIPER
Special Attention
NoSpecatt / Xsystem
Submitted date
2020-08-13
Closed date
2021-01-20
Last modified date
2021-06-11
APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:
IT37228
Fix information
Fixed component name
IBM MQ BASE MP
Fixed component ID
5724H7271
Applicable component levels
[{"Line of Business":{"code":"LOB45","label":"Automation"},"Business Unit":{"code":"BU029","label":"Software"},"Product":{"code":"SSYHRD","label":"IBM MQ"},"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"910"}]
Document Information
Modified date:
13 June 2021