IT38542: Transfer request that hit a problem may see increase in Memory or OutOfMemory Exception

APAR status

• Closed as program error.

Error description

• IBM MQ MFT V9.2.x failed transfer request causes consuming
  memory, which can result over time an OutOfMemory and heap dump
  being generate for MFT agents.
  

Local fix

Problem summary

• ****************************************************************
  USERS AFFECTED:
  This issue affects users of IBM MQ Managed File Transfer
  
  
  Platforms affected:
  MultiPlatform
  
  ****************************************************************
  PROBLEM DESCRIPTION:
  When a transfer request is submitted to the source agent it will
  look to create a state object for the request and place it onto
  the queuedTransfersList in order to be processed.  The agent
  will then look to get the transfer from queuedTransfersList and
  look to process it, and will move it onto the
  activeTransfersList.  If transfer request hits a problem,
  waiting for destination agent capacity or waiting for the
  destination agent to respond with a resync response the transfer
  will be placed on to the inactiveTransfersList &
  inactiveTransfersListForRT.
  
  The agent will look to check for inactive transfer attempt to
  restart the transfer request and will look to remove it from the
  inactiveTransfersList and place it on the activeTransfersList.
   However when it does this it does not remove it from the
  inactiveTransfersListForRT.  This leads to an increase in java
  heap memory and the inactiveTransfersListForRT object growing in
  size.
  

Problem conclusion

• IBM MQ Managed File Transfer has been changed to ensure that we
  release the objects correctly when they are no longer in the
  inactive transfer state.
  
  ---------------------------------------------------------------
  The fix is targeted for delivery in the following PTFs:
  
  Version    Maintenance Level
  v9.2 LTS   9.2.0.5
  v9.x CD    9.2.5
  
  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

  MQ BASE V9.2

• Fixed component ID

  5724H7281

Applicable component levels