IBM Support

LO90482: HIGH THREAD COUNTS DUE TO DB CONTENTION ON THE HEARTBEAT PROCESSING

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APAR status

  • Closed as program error.

Error description

  • High thread counts are seen in Traveler where most of the
    threads are waiting to update the heartbeat information
    including the number of users and devices in the TS_GLOBAL
    table.  If the threads are doing work that is controlled
    OrderLatch's to provide proper operational sequencing, warnings
    about the latches not being able to be maintained and timing out
     may also be seen; they timeout because of the contention in the
     Heartbeat processing.  APAR LO89745 (first shipped in 9.0.1.13)
     prevented the DB connections from getting backlogged because of
     the contention on the Heartbeat processing, but that pushed the
     issue back to the threads but still resulted in a backlog in
    some situations.  This APAR should resolve both the DB
    connection and thread backlogs by making the Heartbeat
    processing non-blocking.
    

Local fix

Problem summary

  • During startup or when load balancing a large number of users
    the Traveler server may become constrained on threads and/or DB
    connections.
    

Problem conclusion

  • The Traveler server was updated to batch heartbeat updates and
    reduce need for multiple threads and database transactions.
    

Temporary fix

Comments

APAR Information

  • APAR number

    LO90482

  • Reported component name

    LOTUS NOTES TRA

  • Reported component ID

    5724E6204

  • Reported release

    901

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2016-10-10

  • Closed date

    2016-11-09

  • Last modified date

    2016-11-09

  • 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

    LOTUS NOTES TRA

  • Fixed component ID

    5724E6204

Applicable component levels

  • R901 PSY

       UP



Document information

More support for: IBM Traveler

Software version: 9.0.1

Reference #: LO90482

Modified date: 09 November 2016


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