IT28907: JMS 2.0 DeliveryDelay performance issue

APAR status

• Closed as program error.

Error description

• When messages are put with a DeliveryDelay, using the IBM MQ JMS
  2.0 client, the queue manager's delivery delay processor task
  performs more slowly than expected if messages are not made
  available to it until after their configured delay interval has
  been reached.
  

Local fix

Problem summary

• ****************************************************************
  USERS AFFECTED:
  This affects users of the JMS 2.0 DeliveryDelay feature
  
  
  Platforms affected:
  MultiPlatform
  
  ****************************************************************
  PROBLEM DESCRIPTION:
  A logic error in the queue manager task which performs the
  processing of messages with a delivery delay meant that messages
  were not correctly processed in batches when they became
  eligible.
  
  In the worst case scenario, it was possible for the task to
  enter a state whereby each messages was put and committed
  individually when its delay interval expired instead of the puts
  being batched as expected, resulting in a visible backlog of
  messages on the delivery delay queue.
  

Problem conclusion

• The delivery delay processor task that runs as part of the MQ
  queue manager when delivery delay is being used has been
  corrected to apply the intended batching logic.
  
  ---------------------------------------------------------------
  The fix is targeted for delivery in the following PTFs:
  
  Version    Maintenance Level
  v8.0       8.0.0.15
  v9.0 LTS   9.0.0.10
  v9.1 CD    TBC.
  v9.1 LTS   9.1.0.5
  
  The latest available maintenance can be obtained from
  'WebSphere MQ Recommended Fixes'
  http://www-1.ibm.com/support/docview.wss?rs=171&uid=swg27006037
  
  If the maintenance level is not yet available information on
  its planned availability can be found in 'WebSphere MQ
  Planned Maintenance Release Dates'
  http://www-1.ibm.com/support/docview.wss?rs=171&uid=swg27006309
  ---------------------------------------------------------------
  

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:

Fix information

• Fixed component name

  IBM MQ BASE MP

• Fixed component ID

  5724H7251

Applicable component levels