A fix is available
APAR status
Closed as program error.
Error description
WebSphere MQ 7.0.1 dot net client application is taking around 2 minutes and sometimes even longer time to register a message listener. No explicit errors reported, traces shows delay in registering message listener.
Local fix
Problem summary
**************************************************************** USERS AFFECTED: This issue affects users of WebSphere MQ v7.0.1 who utilize asynchronous message delivery in a .Net application along with Read Ahead Enabled Platforms affected: All Distributed (iSeries, all Unix and Windows) **************************************************************** PROBLEM SUMMARY: When ReadAhead is enabled and DispatcherThread has a load of messages to be delivered, while delivering the messages, DispatcherThread takes DispatchLock for complete time. At the same time, Main thread is trying to register a message listener(MQCB), this requires suspending Async Service (MQCTL - MQOP_SUSPEND). This means MQCTL is waiting for DispatchLock to be released and this time difference is observed as 2 and half minutes. Sometimes based on number of dispatchers and messages, the time taken to register a message listener further increases.
Problem conclusion
WebSphere MQ NMQI layer Code is modified such that MQCTL- MQOP_SUSPEND is issued, even before waiting for dispatchLock --------------------------------------------------------------- The fix is targeted for delivery in the following PTFs: v7.0 Platform Fix Pack 7.0.1.11 -------- -------------------- Windows 7.0.1.11 AIX 7.0.1.11 HP-UX (PA-RISC) 7.0.1.11 HP-UX (Itanium) 7.0.1.11 Solaris (SPARC) 7.0.1.11 Solaris (x86-64) 7.0.1.11 iSeries 7.0.1.11 Linux (x86) 7.0.1.11 Linux (x86-64) 7.0.1.11 Linux (zSeries) 7.0.1.11 Linux (Power) 7.0.1.11 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
IV37600
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
2013-03-05
Closed date
2013-04-29
Last modified date
2013-04-29
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
[{"Line of Business":{"code":"LOB45","label":"Automation"},"Business Unit":{"code":"BU053","label":"Cloud & Data Platform"},"Product":{"code":"SSFKSJ","label":"WebSphere MQ"},"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"7.0.1"}]
Document Information
Modified date:
03 October 2021