PH03008: MQ CLUSTERING ALLOWS AN OUT-OF ORDER SUBSCRIPTION TO INCORRECTLYREPLACE A NEWER ONE 20/03/20 PTF PEREMOVE

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• When altering cluster queue from PUT(DISABLED) to PUT(ENABLED)
  at Full Repository QMGR, the update is not propagated to Partial
  Repository QMGR (AMQ9428 mismatch subscription is issued by
  Partial Repositoy QMGR), because Full Repository send cluster
  command to Partial Repository with old Subscription ID. This is
  because Subscription is replaced by old one incorrectly on
  Full Repository QMGR.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All users of IBM MQ for z/OS Version 9       *
  *                 Release 0 Modification 0.                    *
  ****************************************************************
  * PROBLEM DESCRIPTION: Changes to a cluster object are not     *
  *                      correctly propagated to a partial       *
  *                      repository that is connected to a full  *
  *                      repository by multiple channels         *
  *                      following a REFRESH CLUSTER command.    *
  ****************************************************************
  A partial repository (PR) remade the subscriptions for a
  cluster queue it had accessed, however the PCF command message
  was delayed reaching the full repository (FR).
  At the same time REFRESH CLUSTER was issued on the PR, and the
  command messages associated with the refresh arrived at the FR
  using a different channel, and the subscription for the queue
  was deleted.
  When the PR accessed the queue again, a new subscription was
  created, however when the delayed PCF message subsequently
  arrived it caused the new subscription to be replaced by the old
  subscription.
  This resulted in the PR rejecting updates to the queue as
  reported by error AMQ9428 (if the PR runs on distributed
  platforms) or CSQX428E (if the PR runs on z/OS).
  

Problem conclusion

• rrmQueryObject is changed to correctly determine the newer
  subscription, and to prevent it replacing the new subscription
  with an older subscription for the object.
  

Temporary fix

Comments

APAR Information

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

  PI96330

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

  UI58771

Modules/Macros

• CSQXRRMF
  

Fix information

• Fixed component name

  IBM MQ Z/OS V9

• Fixed component ID

  5655MQ900

Applicable component levels

• R000 PSY UI58771

     UP18/10/27 P F810

Fix is available

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