A fix is available
APAR status
Closed as program error.
Error description
Multiple application threads (WMB for example) getting messages from a queue that require the same data conversion and the conversion table is not available can leave one of the threads hanging forever. When the hanging thread is cancelled the message is rolled back to the input queue.
Local fix
Problem summary
**************************************************************** * USERS AFFECTED: All users of WebSphere MQ Version 7 * * Release 0 Modification 1 and * * Release 1 Modification 0. * **************************************************************** * PROBLEM DESCRIPTION: Application threads hang during MQGET * * when they request the same data * * conversion (same from/to CCSIDs) and * * the conversion table is not available. * **************************************************************** * RECOMMENDATION: * **************************************************************** In the situation where multiple threads request the same data conversion table to be loaded simultaneously and the table is not available, it can happen that one or more of those threads are left waiting forever for the table to load due to a synchronization problem.
Problem conclusion
The code has been changed to improve synchronization around loading conversion tables, ensuring that all threads waiting for the tables to load are resumed. 010Y 100Y CSQALOCT CSQMLOCT CSQXLOCT
Temporary fix
Comments
APAR Information
APAR number
PM99531
Reported component name
WMQ Z/OS V7
Reported component ID
5655R3600
Reported release
010
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt / Xsystem
Submitted date
2013-10-21
Closed date
2013-11-05
Last modified date
2013-12-02
APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:
UI12187 UI12188
Modules/Macros
CSQALOCT CSQMLOCT CSQXLOCT
Fix information
Fixed component name
WMQ Z/OS V7
Fixed component ID
5655R3600
Applicable component levels
Fix is available
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Document Information
Modified date:
02 December 2013