PH23018: MQ ARCHIVE LOGS LEFT AS NOT-REUSABLE WHEN MULTIPLE LOGS ARE BEING ARCHIVED AND ARCHIVE LOG CANCEL OFFLOAD IS ISSUED.

Obtain the fix for this APAR.

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  contain log data which hasn't been archived.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 8       *
  *                 Release 0 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 is sysrouted FROM one or more of the following:

• APAR is sysrouted TO one or more of the following:

  PH24650 UI69698

Modules/Macros

• CSQJOFF1 CSQJOFF2 CSQJOFF6 CSQJOFF7 CSQJOFF9
  

Fix information

• Fixed component name

  IBM MQ Z/OS V8

• Fixed component ID

  5655W9700

Applicable component levels

• R000 PSY UI71357

     UP20/10/14 P F010 ¢

Fix is available

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