PH10488: A QUEUE INDEXED BY GROUPID WITH ONLY ONE MESSAGE IN A GROUP. AN APPLICATION BROWSING THROUGH THE QUEUE LOOPS.

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• A queue is indexed by GroupId and contains only one message in a
  group. Using one of the REXX MQ APIs lead to an indefinitely
  loop browsing through the queue.
  
  The problem only happens if the group consists of only one
  message. The following get message option were used for each
  MQGET:
  
  MQGMO_WAIT
  MQGMO_BROWSE_NEXT
  MQGMO_LOGICAL_ORDER
  MQGMO_ALL_MSGS_AVAILABLE
  .
  Additional keywords:
  INDXTYPE
  

Local fix

• n/a
  

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: An application browsing a queue indexed *
  *                      by GroupId loops indefinitely when a    *
  *                      group contains only one message.        *
  ****************************************************************
  A queue indexed by GroupId contains a group containing only one
  message. The message specifies MQGMO_LOGICAL_ORDER and
  MQMF_LAST_MSG_IN_GROUP. An application browsing the queue loops
  indefinitely continually reading the same message. The problem
  arises as in these circumstance the module which updates the
  group information in the open handle, csqmggru, does not update
  the browse cursor after each read, so it always points at the
  same message.
  
  Additional keywords: REXX
  

Problem conclusion

• MQGET browse processing in csqmggru is updated for the reported
  problem to update the browse cursor after each read.
  

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:

  UI64337 UI64338

Modules/Macros

• CSQMGGRU
  

Fix information

• Fixed component name

  IBM MQ Z/OS V9

• Fixed component ID

  5655MQ900

Applicable component levels

• R000 PSY UI64337

     UP19/09/26 P F909

• R100 PSY UI64338

     UP19/09/26 P F909

Fix is available

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