IT40797: AFTER APPLYING MAINTENANCE CHANNEL REPORTS AMQ9514 EVEN THOUGH ADOPTNEWMCA FUNCTION IS ENABLED

APAR status

• Closed as program error.

Error description

• After applying a version of MQ containing a fix for APAR IT27810
  the AdoptNewMCA capability stopped working, the consequence of
  this is that MQ could not automatically recover and successfully
  restart a channel where the receiving MCA had hung.
  
  A channel that is attempting to restart as a result of a network
  error reports AMQ9514 (channel is in use), even though the
  AdoptNewMCA setting is configured to allow the new channel
  instance to take over.
  

Local fix

• TCP/IP Keepalive and/or channel heartbeats may be effective
  where network connectivity has been lost.
  
  If a responding channel agent is otherwise hung, for example
  blocked in a channel exit, issuing a STOP CHANNEL(channel_name)
  MODE(FORCE) STATUS(INACTIVE) on the responding end of the
  connection should allow a subsequent restart from the initiating
  side of the channel to be successful.
  

Problem summary

• ****************************************************************
  USERS AFFECTED:
  Any users that rely on Adopt MCA are potentially affected.
  
  The issue described in this APAR has been addressed for IBM MQ
  on distributed platforms under APAR IT31027.
  This APAR provides the remediation of the same issue for IBM MQ
  on HPe NonStop.
  ****************************************************************
  PROBLEM DESCRIPTION:
  The Adopt MCA function enables IBM MQ to cancel a receiver
  channel and start a new one in its place. Additional checks were
  added by APAR IT27810 to ensure only only a single channel
  pairing could run between two queue managers which prevents the
  Adopt MCA function from working correctly.
  

Problem conclusion

• The order of the checks is corrected to permit the Adopt MCA
  function, if configured to cancel a receiver channel.
  
  ---------------------------------------------------------------
  The fix is targeted for delivery in the following PTFs:
  
  Version    Maintenance Level
  v8.1       8.1.0.10
  The latest available maintenance can be obtained from
  'Recommended Fixes for IBM MQ'
  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 'IBM 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 FOR HPE NS O

• Fixed component ID

  5724A3904

Applicable component levels