PH49992: PUBSUB BEHAVIOR DIFFERS BETWEEN MQ ON DISTRIBUTED, AND MQ ON Z/OS

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• MQ Distributed does the put of the COA message with a PubLevel
  of 9 which will result in all subscribers getting the
  publication. This is working for the customer in this
  environment.
  However, with MQ on Z/os, a MQPMO PubLevel of 0 is used. This
  results in all subscribers with a SubLevel greater than 0 not
  receiving the publication.
  So, with MQ on Z/os in the mix, subscribers never received the
  messages as intended.
  
  This APAR is to align the  behavior of MQ on Z/os, with the
  correct behavior of MQ on Distributed.
  

Local fix

• Alter your durable subscriptions to have SUBLEVEL(0), and it
  should work similar to MQ on Distributed Platform.
  

Problem summary

• ****************************************************************
  * USERS AFFECTED: All users of IBM MQ for z/OS Version 9       *
  *                 Release 2 Modification 0 and                 *
  *                 Release 3 Modification 0.                    *
  ****************************************************************
  * PROBLEM DESCRIPTION: A topic's subscribers were not          *
  *                      receiving a confirm on arrival (COA)    *
  *                      message after specifying an alias queue *
  *                      to the topic as the ReplyToQ. The       *
  *                      subscribers were using the default      *
  *                      SUBLEVEL(1).                            *
  ****************************************************************
  The report message code was changed to support passing on
  message properties. This had the side effect that we now use
  values from both the new and old versions of the report message
  code including the PubLevel being initialised to 0. As the
  default subscriber object level is 1, the subscribers were not
  getting the COA message.
  

Problem conclusion

• The code has been changed to initialise the PubLevel to the
  correct default level of 9.
  

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:

  UI91600 UI91601

Modules/Macros

• CSQMREPM
  

Fix information

• Fixed component name

  IBM MQ Z/OS V9

• Fixed component ID

  5655MQ900

Applicable component levels

• R200 PSY UI91601

     UP23/06/15 P F306

• R300 PSY UI91600

     UP23/06/15 P F306

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.