PM39961: ESDS AUTOJOURNAL WRITE-ADD-COMPLETE RECORDS OUT OF RBA SEQUENCE

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• Files have been defined with JNLADD as AFTER. This means that
  FCTJWAC is set, but not FCTJWA, which would indicate
  autojournalling before the VSAM call rather than after it. Code
  in DFHFCVS will acquire the ESDS write lock if either FCTBACKO
  or FCTJWA are set on. Since neither are set currently, we do not
  get the write lock around the calls to VSAM and the LG domain,
  and hence they are not treated as a serialised operation. This
  allows for races between tasks and the potential for occasional
  autojournal after images to be written in opposing order within
  a log block.
  Additional Keyword(s) : RBA , RBARPT
  KIXREVEPH
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All                                          *
  ****************************************************************
  * PROBLEM DESCRIPTION: Autojournal write add complete records  *
  *                      may be out of sequence with writes to   *
  *                      an ESDS.                                *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  On a busy system, it is possible for CICS tasks to interleave
  between calls to write to a non-recoverable ESDS file, and the
  subsequent calls to journal the write add complete autojournal
  log record for the write operation. This can lead to the
  ESDS RBAs being autojournalled out of the order in which
  records were written to the file. It requires write-add-complete
  autojournalling to be defined without write-add journalling
  and/or recoverable logging as well.
  KEYWORDS: FCTJWAC
  

Problem conclusion

• DFHFCVS has been changed to acquire the ESDS write lock enq for
  the duration of the request to write to VSAM and then journal
  the write-add-complete autojournal record. This matches the
  existing behaviour for write-add journalling and recovery
  (backout) logging.
  

Temporary fix

• FIX AVAILABLE BY PTF ONLY
  

Comments

APAR Information

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

  PM39862

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

  UK69193

Modules/Macros

•    DFHFCVS
  

Fix information

• Fixed component name

  CICSTS V3 Z/OS

• Fixed component ID

  5655M1500

Applicable component levels

• R500 PSY UK69193

     UP11/07/07 P F107

Fix is available

• Select the PTF appropriate for your component level. You will be required to sign in. Distribution on physical media is not available in all countries.