IBM Support

IT30074: Improve channel detection of socket errors

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APAR status

  • Closed as program error.

Error description

  • When a channel is in wait state there is no health
    monitoring of the underlying socket in use by the channel.
    

Local fix

Problem summary

  • ****************************************************************
    USERS AFFECTED:
    This issue potentially affects MQ users that encounter
    connection failures between queue managers.
    
    
    Platforms affected:
    MultiPlatform
    
    ****************************************************************
    PROBLEM DESCRIPTION:
    After a channel MCA has sent a batch of messages and is waiting
    for the peer to acknowledge receipt, detection of a network
    failure during this period of time relied upon connection health
    checks, for example channel heartbeat or TCP/IP keepalive.
    Typically the timers involved in these types of health check
    could take several minutes to determine that a connection was no
    longer viable and for a channel that is eligible to be retried,
    this may have delayed the delivery of the batch.
    
    Batch confirmation should not normally take more than a few
    seconds.
    

Problem conclusion

  • Additional checks have been added to channels during batch
    confirmation to allow them to more quickly detect a loss of
    connectivity.
    
    ---------------------------------------------------------------
    The fix is targeted for delivery in the following PTFs:
    
    Version    Maintenance Level
    v9.1 CD    9.1.3
    v9.1 LTS   9.1.0.4
    
    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

    IT30074

  • Reported component name

    IBM MQ BASE MP

  • Reported component ID

    5724H7271

  • Reported release

    910

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2019-08-23

  • Closed date

    2019-09-30

  • Last modified date

    2021-07-07

  • 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 BASE MP

  • Fixed component ID

    5724H7271

Applicable component levels

[{"Type":"MASTER","Line of Business":{"code":"LOB45","label":"Automation"},"Business Unit":{"code":"BU053","label":"Cloud & Data Platform"},"Product":{"code":"SSYHRD","label":"IBM MQ"},"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"All Versions"}]

Document Information

Modified date:
08 July 2021