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IZ66777: FAILURE TO PROCESS MESSAGES FOLLOWING A RESTART OF THE WMQ V6 PUB/SUB MESSAGE BROKER

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APAR status

  • Closed as program error.

Error description

  • After restarting the pub/sub broker (strmqbrk), the broker
    fails to restore the current set of subscriptions and will
    generate FFSTs with probe id PU294005. AMQ5820 and AMQ5819
    messages will be reported in the error logs. Queue manager
    or broker restart does not resolve this issue.
    Key FDC Fields:
    Probe Id :- PU294005
    Component :- fkiRestoreSubscription
    Program Name :- amqfcxba
    Major Errorcode :- frcE_UNEXPECTED_ERROR
    MQM Function Stack
    fpiTaskReply
    faxRunStream
    fkxStartStream
    fkiRestoreRegistrations
    fkiProcessChangeRecord
    fkiReplayRegistrationRecord
    fkiRestoreSubscription
    xcsFFST
    

Local fix

Problem summary

  • ****************************************************************
    USERS AFFECTED:
    Users who de-register durable subscriptions and then re-
    register subscriptions using the same subscription name.
    
    Platforms affected:
    All Distributed (iSeries, all Unix and Windows)
    ****************************************************************
    PROBLEM SUMMARY:
    MQ stores details of subscribers in MQ queues. At broker
    restart the queue is browsed to recreate a memory image of the
    subscription state. The messages were not being read from the
    queue in the same order as they were being written, and in some
    circumstances a sequence of
    subscribe ; unsubscribe ; subscribe
    could be replayed as
    subscribe ; subscribe ; unsubscribe
    In these cases the second subscription will be detected as
    invalid and the PU294005 FDC will be raised.
    

Problem conclusion

  • The code was changed such that the subscription messages are
    replayed at broker restart in the same order as those
    subscription messages were originally written.
    
    ---------------------------------------------------------------
    The fix is targeted for delivery in the following PTFs:
    
                       v6.0
    Platform           Fix Pack 6.0.2.9
    --------           --------------------
    Windows            U200313
    AIX                U828012
    HP-UX (PA-RISC)    U827381
    HP-UX (Itanium)    U827383
    Solaris (SPARC)    U827693
    Solaris (x86-64)   U828055
    iSeries            tbc_p600_0_2_9
    Linux (x86)        U827380
    Linux (x86-64)     U827694
    Linux (zSeries)    U827590
    Linux (Power)      U827382
    Linux (s390x)      U827695
    
    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

    IZ66777

  • Reported component name

    WMQ LIN X86 V6

  • Reported component ID

    5724H7204

  • Reported release

    602

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2009-12-14

  • Closed date

    2009-12-24

  • Last modified date

    2009-12-24

  • 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

    WMQ LIN X86 V6

  • Fixed component ID

    5724H7204

Applicable component levels

  • R602 PSY

       UP

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Document Information

Modified date:
24 December 2009