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IT17751: MQTT server fails to publish LWT messages to subscribers when client loses connectivity

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APAR status

  • Closed as program error.

Error description

  • MQTT server fails to publish a 'last will and testament' (LWT)
    message to subscribers when client loses connectivity.
    
    The following errors may be observed in mqxr.log:
    
    AMQXR0021W: Client ''XYZ'' at network address ''/1.2.3.4''
    disconnected abnormally
    
    Messages would be stored in SYSTEM.MQTT.PERSISTENT.STATE queue
    and processed when the connection is restored.
    

Local fix

Problem summary

  • ****************************************************************
    USERS AFFECTED:
    This issue affects users specifying last will and testament
    messages while connecting MQTT clients to queue managers.
    
    
    Platforms affected:
    MultiPlatform
    
    ****************************************************************
    PROBLEM DESCRIPTION:
    A last will and testament message specified when connecting a
    MQTT client to a queue manager was not sent to the specified
    topic if that client's connection was unexpectedly broken. The
    message remained on the SYSTEM.MQTT.PERSISTENT.STATE queue.
    

Problem conclusion

  • Any last will and testament message specified when a MQTT client
    connects is now sent to the specified topic if that client's
    connection breaks unexpectedly.
    
    ---------------------------------------------------------------
    The fix is targeted for delivery in the following PTFs:
    
    Version    Maintenance Level
    v7.5       7.5.0.9
    v8.0       8.0.0.8
    v9.0 CD    9.0.4
    v9.0 LTS   9.0.0.2
    
    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

    IT17751

  • Reported component name

    WMQ BASE MULTIP

  • Reported component ID

    5724H7241

  • Reported release

    750

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2016-10-31

  • Closed date

    2017-06-25

  • Last modified date

    2017-06-25

  • 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 BASE MULTIP

  • Fixed component ID

    5724H7241

Applicable component levels

[{"Business Unit":{"code":"BU048","label":"IBM Software"},"Product":{"code":"SSCPQ63","label":"APAR \/ Maintenance"},"Component":"","ARM Category":[],"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"7.5","Edition":"","Line of Business":{"code":"","label":""}}]

Document Information

Modified date:
25 June 2017