IT29783: Querying queue manager status may cause performance overheads onMQ appliance

APAR status

• Closed as program error.

Error description

• On the IBM MQ appliance, the mechanism by which the queue
  manager
  status is queried when REST URI /mgmt/status or show qm-status
  is used is by initiating multiple product command sequences
  internally to obtain the information. This can cause performance
  overheads.
  
  Additionally, if queue manager status is queried after an
  appliance restart, a transient HA state may result in a blank
  status being reported for an HA queue manager.
  

Local fix

Problem summary

• ****************************************************************
  USERS AFFECTED:
  All IBM MQ Appliance users who query queue manager status using
  the REST API or show qm-status.
  
  
  Platforms affected:
  MultiPlatform
  
  ****************************************************************
  PROBLEM DESCRIPTION:
  When queue manager status is queried using REST or through the
  show qm-status it took  longer than expected to fetch the
  output. The overheads of inefficiencies in this command were
  apparent in the overall system resource usage when a large
  number of HA queue managers were defined and their status
  queried. Also, when the HA queue managers are in a transient
  state following a system reboot the HA status was sometimes
  displayed as blank.
  

Problem conclusion

• The design of the status checking logic has been modified to
  improve the performance and it ensures that the transient states
  are handled correctly and a valid HA status is displayed to the
  user.
  
  ---------------------------------------------------------------
  The fix is targeted for delivery in the following PTFs:
  
  Version    Maintenance Level
  v9.1 LTS   9.1.0.7
  
  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

  IBM MQ APPL M20

• Fixed component ID

  5725Z0900

Applicable component levels