IT37207: MQINPUT NODE CONFIGURED WITH ORDER MODE VALUE AS 'BY USER ID' MAY CAUSE DEADLOCK

APAR status

• Closed as program error.

Error description

• MQInput node may get into a deadlock when it is configured with
  order mode property as 'By User ID'. The issue happens when the
  execution goes into the following path:
  1. An exception thrown from the flow causes a rollback of the
  transaction and the message is rolled back to the input queue.
  
  2. The rolled back message is picked again and propagated to the
  failure terminal as the backout count is exceeded.
  
  
  Once the issue hits, the MQInput node fails to pick further
  messages and it will need a restart of the message flow to
  recover.
  

Local fix

• NA
  

Problem summary

• ****************************************************************
  USERS AFFECTED:
  All Users of IBM App Connect Enterprise V12, V11 and IBM
  Integration Bus V10 using MQInput node's order mode property
  
  
  Platforms affected:
  z/OS, MultiPlatform
  
  ****************************************************************
  PROBLEM DESCRIPTION:
  MQInput node may get into a deadlock when it is configured with
  order mode property as 'By User ID'. The issue can happen when
  the message flow goes through the following execution path:
  
  1. An exception thrown from the flow causes a rollback of the
  transaction and the message is rolled back to the input queue.
  
  2. The rolled-back message is picked again and propagated to the
  failure terminal as the backout count is exceeded.
  
  Once the issue hits, the MQInput node fails to pick further
  messages and it will need a restart of the message flow to
  recover
  

Problem conclusion

• The MQInput node is fixed to avoid deadlock when configured to
  use order mode property.
  
  ---------------------------------------------------------------
  The fix is targeted for delivery in the following PTFs:
  
  Version    Maintenance Level
  v10.0      10.0.0.25
  v11.0      11.0.0.14
  v12.0      12.0.2.0
  
  The latest available maintenance can be obtained from:
  http://www-01.ibm.com/support/docview.wss?rs=849&uid=swg27006041
  
  If the maintenance level is not yet available,information on
  its planned availability can be found on:
  http://www-1.ibm.com/support/docview.wss?rs=849&uid=swg27006308
  ---------------------------------------------------------------
  

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

  INTEGRATION BUS

• Fixed component ID

  5724J0540

Applicable component levels