IT15770: MQV8 MEMORY LEAK IN PUBSUB TOPIC SCAVENGER ROUTINE

APAR status

• Closed as program error.

Error description

• Available memory on the system may either become exhausted or
  may be seen to be increasing in an unbounded manner.
  
  Further investigation may show that the Java JVM process and the
  MQ amqzmuc0 process are using a large amount of memory.
  

Local fix

Problem summary

• ****************************************************************
  USERS AFFECTED:
  Users with large number of topic nodes in their topic tree may
  encounter this issue.
  
  
  Platforms affected:
  MultiPlatform
  
  ****************************************************************
  PROBLEM DESCRIPTION:
  The topic scavenger routine which checks and reclaims the space
  used
  by dynamic topic nodes did not correctly free all allocated
  memory for nodes
  in the topic tree, once the memory was no longer required,
  resulting in a rise in reported memory usage.
  

Problem conclusion

• The code has been modified to free memory associated with a
  topic node once it is removed from the tree.
  
  ---------------------------------------------------------------
  The fix is targeted for delivery in the following PTFs:
  
  Version    Maintenance Level
  v8.0       8.0.0.7
  v9.0 CD    9.0.2
  v9.0 LTS   9.0.0.2
  
  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:

  PH27898

Fix information

• Fixed component name

  WMQ BASE MULTIP

• Fixed component ID

  5724H7251

Applicable component levels