IBM Support

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

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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 number

    IT22864

  • Reported component name

    IBM MQ BASE MP

  • Reported component ID

    5724H7251

  • Reported release

    800

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    YesHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2017-10-20

  • Closed date

    2017-11-29

  • Last modified date

    2017-11-29

  • 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

[{"Business Unit":{"code":"BU053","label":"Cloud & Data Platform"},"Product":{"code":"SSYHRD","label":"IBM MQ"},"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"8.0.0.0","Line of Business":{"code":"LOB36","label":"IBM Automation"}}]

Document Information

Modified date:
15 August 2020