PH63289: IBM MQ Z/OS: SERVICEABILITY IMPROVEMENTS FOR CSQWDPRD FOR LOOPS IN CONTROL BLOCK CHAINS

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• Serviceability improvements for CSQWDPRD when processing control
  block chains which have loops in the chain. The cause of the
  loop was likely due to asynchronous dump capture processing.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All users of IBM MQ for z/OS Version 9       *
  *                 Release 3 Modification 0 and                 *
  *                 Release 4 Modification 0.                    *
  ****************************************************************
  * PROBLEM DESCRIPTION: When processing control block chains    *
  *                      that loop back on themselves, creating  *
  *                      an infinite loop, the CSQWDPRD dump     *
  *                      formatter will produce an extremely     *
  *                      long chain, resulting in slow           *
  *                      formatting.                             *
  ****************************************************************
  The CSQWDPRD dump formatter does not have a means for the user
  to control how many iterations of control blocks to format out
  in a chain, and the internal default was too large in some
  cases.
  

Problem conclusion

• The default number of iterations through a control block chain
  has been significantly reduced to 100000. Users can now specify
  MAXLP in the formatter parameters to specify the maximum number
  of iterations through a control block.
  

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:

  UO05838 UO05839

Modules/Macros

• CSQ7CBL  CSQ7FMT  CSQWDPR1 CSQWDPRD
  

Fix information

• Fixed component name

  IBM MQ Z/OS V9

• Fixed component ID

  5655MQ900

Applicable component levels

• R300 PSY UO05839

     UP26/01/10 P F601

• R400 PSY UO05838

     UP26/01/10 P F601

Fix is available

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