IT22864: When upgrading MQ 7.0 to MQ 8.0, queue manager cluster channels are stuck in initializing state.

APAR status

• Closed as program error.

Error description

• After upgrading from MQ 7.0 to MQ 8.0, queue manager cluster
  channels become stuck in initializing state.
  
  The DISPLAY CHSTATUS command takes long time to complete.
  

Local fix

• Resource contention is thought to be a contributing factor to
  this problem occurring and so moving IBM MQ to a more capable
  environment may resolve the issue.
  

Problem summary

• ****************************************************************
  USERS AFFECTED:
  Users of MQ clustering who have a large number of transient
  client connections may be affected by this issue.  The issue may
  be more likely to occur on machines which suffer resource
  contention.
  
  
  Platforms affected:
  MultiPlatform
  
  ****************************************************************
  PROBLEM DESCRIPTION:
  A request to start a cluster channel could be delayed
  indefinitely if a large number of channels are constantly ending
  since IBM MQ would process these "end channel" events in
  preference to processing start channel requests.
  

Problem conclusion

• The code has been modified to add an upper limit on the amount
  of time that IBM MQ will spend processing "end channel" events
  before processing requests to start new channels.
  
  ---------------------------------------------------------------
  The fix is targeted for delivery in the following PTFs:
  
  Version    Maintenance Level
  v8.0       8.0.0.9
  v9.0 CD    9.0.5
  v9.0 LTS   9.0.0.3
  
  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:

  IT33908

Fix information

• Fixed component name

  IBM MQ BASE MP

• Fixed component ID

  5724H7251

Applicable component levels