A fix is available
APAR status
Closed as program error.
Error description
Timing issue when multiple logs are being archived and ARCHIVE LOG CANCEL OFFLOAD is issued. In these circumstances, the existing archiving task is terminated and a new task is started to retry the archiving. It is possible for the new task to begin processing the archiving work before the old task has fully cleaned up its state, which can result in logs being archived out of order. It isn't expected for logs to be archived out of order, so once a log with a high RBA is archived, any logs with lower RBA values will be ignored by the archiving task. This leaves some active logs as "NOT-REUSABLE" because they contain log data which hasn't been archived.
Local fix
na
Problem summary
**************************************************************** * USERS AFFECTED: All users of IBM MQ for z/OS Version 9 * * Release 0 Modification 0 and Release 1 * * Modification 0. * **************************************************************** * PROBLEM DESCRIPTION: When issuing an ARCHIVE LOG CANCEL * * OFFLOAD, there exists a timing window * * where if the offloading is delayed, * * some of the logs may not be archived. * **************************************************************** If log offloading is stalling and an ARCHIVE LOG CANCEL OFFLOAD is issued, it is possible for a log with a higher RBA value to get offloaded ahead of other offloads. The log processing won't attempt to offload any logs with lower RBA values so this leaves an orphaned active log and a hole in the archived logs.
Problem conclusion
Log offload serialisation has been improved to stop logs being archived out of order.
Temporary fix
Comments
APAR Information
APAR number
PH24650
Reported component name
IBM MQ Z/OS V9
Reported component ID
5655MQ900
Reported release
000
Status
CLOSED PER
PE
NoPE
HIPER
YesHIPER
Special Attention
NoSpecatt / Xsystem
Submitted date
2020-04-21
Closed date
2020-05-27
Last modified date
2020-11-02
APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:
UI69689 UI69690
Modules/Macros
CSQJOFF1 CSQJOFF2 CSQJOFF6 CSQJOFF7 CSQJOFF9
Fix information
Fixed component name
IBM MQ Z/OS V9
Fixed component ID
5655MQ900
Applicable component levels
Fix is available
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Document Information
Modified date:
03 November 2020