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PM58610: WEBSPHERE SCHEDULER POLL DAEMON ACTIVE IN ALL SERVANTS FOR A SERVER ON ZOS

Fixes are available

7.0.0.25: WebSphere Application Server V7.0 Fix Pack 25
8.5.0.1: WebSphere Application Server V8.5 Fix Pack 1
8.0.0.5: WebSphere Application Server V8.0 Fix Pack 5
7.0.0.27: WebSphere Application Server V7.0 Fix Pack 27
8.5.0.2: WebSphere Application Server V8.5 Fix Pack 2
8.0.0.6: WebSphere Application Server V8.0 Fix Pack 6
7.0.0.29: WebSphere Application Server V7.0 Fix Pack 29
8.0.0.7: WebSphere Application Server V8.0 Fix Pack 7
6.1.0.47: WebSphere Application Server V6.1 Fix Pack 47
8.0.0.8: WebSphere Application Server V8.0 Fix Pack 8
7.0.0.31: WebSphere Application Server V7.0 Fix Pack 31
7.0.0.27: Java SDK 1.6 SR13 FP2 Cumulative Fix for WebSphere Application Server
7.0.0.33: WebSphere Application Server V7.0 Fix Pack 33
8.0.0.9: WebSphere Application Server V8.0 Fix Pack 9
7.0.0.35: WebSphere Application Server V7.0 Fix Pack 35
8.0.0.10: WebSphere Application Server V8.0 Fix Pack 10
7.0.0.37: WebSphere Application Server V7.0 Fix Pack 37
8.0.0.11: WebSphere Application Server V8.0 Fix Pack 11
7.0.0.39: WebSphere Application Server V7.0 Fix Pack 39
8.0.0.12: WebSphere Application Server V8.0 Fix Pack 12
7.0.0.41: WebSphere Application Server V7.0 Fix Pack 41
8.0.0.13: WebSphere Application Server V8.0 Fix Pack 13
7.0.0.43: WebSphere Application Server V7.0 Fix Pack 43
8.0.0.14: WebSphere Application Server V8.0 Fix Pack 14
7.0.0.45: WebSphere Application Server V7.0 Fix Pack 45
8.0.0.15: WebSphere Application Server V8.0 Fix Pack 15
6.1.0.45: Java SDK 1.5 SR14 Cumulative Fix for WebSphere Application Server
6.1.0.47: Java SDK 1.5 SR16 Cumulative Fix for WebSphere Application Server
7.0.0.25: Java SDK 1.6 SR11 Cumulative Fix for WebSphere Application Server
7.0.0.27: Java SDK 1.6 SR12 Cumulative Fix for WebSphere Application Server
7.0.0.29: Java SDK 1.6 SR13 FP2 Cumulative Fix for WebSphere Application Server
7.0.0.45: Java SDK 1.6 SR16 FP60 Cumulative Fix for WebSphere Application Server
7.0.0.31: Java SDK 1.6 SR15 Cumulative Fix for WebSphere Application Server
7.0.0.35: Java SDK 1.6 SR16 FP1 Cumulative Fix for WebSphere Application Server
7.0.0.37: Java SDK 1.6 SR16 FP3 Cumulative Fix for WebSphere Application Server
7.0.0.39: Java SDK 1.6 SR16 FP7 Cumulative Fix for WebSphere Application Server
7.0.0.41: Java SDK 1.6 SR16 FP20 Cumulative Fix for WebSphere Application Server
7.0.0.43: Java SDK 1.6 SR16 FP41 Cumulative Fix for WebSphere Application Server
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APAR status

  • Closed as program error.

Error description

  • Typically the WebSphere Scheduler service requires only one
    instance being active in a cluster of servers.  However,
    WebSphere for z/OS servers are normally configured with
    multiple servants and the scheduler poll daemon
    does not restrict itself to operating in only one
    Servant region.  This can lead to multiple servants attempting
    to run the same task.
    
    One of the possible symptoms can be the following warning:
    com.ibm.websphere.scheduler.TaskPending: SCHD0057W: The task
    information for task ID 1664701 for scheduler MyScheduler
    (MyScheduler) cannot be updated in the database because the
    task has already been run by another Scheduler, the task
    information was changed, or the task was cancelled.
    

Local fix

Problem summary

  • ****************************************************************
    * USERS AFFECTED:  All users of IBM WebSphere Application      *
    *                  Server V7.0, V8.0 and V8.5                  *
    ****************************************************************
    * PROBLEM DESCRIPTION: All Servants attempts to fire the       *
    *                      same task within a z/OS server          *
    *                      resulting in SCHD0057W                  *
    ****************************************************************
    * RECOMMENDATION:                                              *
    ****************************************************************
    The scheduler service will be started on all servers in the
    cluster. A lease is required for the scheduler service
    to start processing the tasks and for ensuring that only one
    scheduler instance will fire the task. Typically the
    server that comes up first will obtain the lease.
    WebSphere z/OS platform supports multiple servants for Workload
    Managament (WLM) and it was found that  all of these servants
    within a z/OS server were able to obtain the leases. This was
    possible because the scheduler uses the server name for the
    lease owner name and all of these servant shared the same name
    and hence they were all able to obtain the lease and also can
    fire the tasks.
    This can result in the following messages in a multi servant
    zOS environment:
    com.ibm.websphere.scheduler.TaskPending: SCHD0057W: The task
    information for task ID 1664701 for scheduler MyScheduler
    (MyScheduler) cannot be updated in the database because the
    task has already been run by another Scheduler, the task
    information was changed, or the task was cancelled.
    Now with this APAR, the lease owner name has been made unique
    to uniquely identify each servant and thereby ensuring only one
    servant will obtain the lease at any point of time.
    

Problem conclusion

  • The WebSphere scheduler component has been updated such that
    the scheduler poll daemon is active on only on servant in a
    z/OS server envrionment.
    
    APAR PM58610 is currently targeted for inclusion in
    WebSphere Application Server Fix Packs 7.0.0.25, 8.0.0.5, and
    8.5.0.1.
    
    Sysroute APAR PM65489 will be used to deliver this fix in
    WebSphere Application Server V6.1 Fix Pack 6.1.0.45.
    
    Please refer to URL:
    //www.ibm.com/support/docview.wss?rs=404&uid=swg27006970
    for Fix Pack availability.
    

Temporary fix

Comments

APAR Information

  • APAR number

    PM58610

  • Reported component name

    WEBSPHERE FOR Z

  • Reported component ID

    5655I3500

  • Reported release

    700

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2012-02-20

  • Closed date

    2012-05-24

  • Last modified date

    2012-11-02

  • APAR is sysrouted FROM one or more of the following:

  • APAR is sysrouted TO one or more of the following:

    PM65489

Fix information

  • Fixed component name

    WEBSPHERE FOR Z

  • Fixed component ID

    5655I3500

Applicable component levels

  • R700 PSY UK81738

       UP12/10/04 P F210

Fix is available

  • Select the PTF appropriate for your component level. You will be required to sign in. Distribution on physical media is not available in all countries.



Document information

More support for: WebSphere Application Server for z/OS
General

Software version: 7.0

Reference #: PM58610

Modified date: 02 November 2012