PM56377: EXTERNALLY SUBMITTED JOB MAY BE INCORRECTLY TRACKED AGAINST TWO SEPARATE SCHEDULED OCCURRENCES

APAR status

• Closed as fixed if next.

Error description

• When a TWSz-scheduled job defined with SUBMIT=NO is submitted
  outside of TWSz, it may be incorrectly tracked twice, against
  two separate scheduled occurrences, under the following
  conditions:
  1. An occurrence of the application containing this job is in
     the current plan in READY status
  2. A CP EXTEND process starts
  3. While the CP EXTEND is running, the job is submitted.
  4. The CP EXTEND adds another occurrence of the same application
     with a LATEST START TIME *EARLIER* than the pre-existing
     occurrence.
  5. The original application occurrence must not complete before
     the new current plan is brought into production.
  When this happens, the job is tracked "real time" against the
  originally scheduled occurrence, allowing that operation's
  SUCCESSORS to start. But then, when the new plan is brought into
  production and is brought up to date by applying the updates
  logged in the JTLogs while the CP was being created, the re-
  apply of JT events incorrectly associates the job with the NEWLY
  SCHEDULED occurrence.
  .
  The problem can be avoided by making certain that the LATEST
  START TIMES for operations tracking externally submitted jobs
  are always in INPUT ARRIVAL sequence.  This can most easily
  be accomplished by assigning a valid operation-level deadline
  to the operation.
  .
  JT REAPPLY TURNOVER CATCHUP
  This problem is being addressed in APAR PM77745
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: ALL TWS for z/OS USERs                       *
  *                 FUNCTION=MCP                                 *
  ****************************************************************
  * PROBLEM DESCRIPTION: Externally submitted job incorrectly    *
  *                      tracked in particular situation         *
  ****************************************************************
  * RECOMMENDATION: APPLY THE PTF FIXING THIS APAR               *
  ****************************************************************
  Following is the scenario:
  1. Add to the CP an occurrence for an application having
     an operation in Ready/Arriving status with submit=NO
     and an externally submit job.
  2. Run an EXTEND of the plan for one day so that another
     occurrence of the same application will be added but
     with the affected operation having
     a Latest Start Time earlier of the already present
     one and being in Ready/Arriving status as well
  3. While the CP extend is running, but before the new
     occurrence will be added, submit the external job
     The original operation must not complete before
     the new current plan is brought into production
     (job event split in turnover phase)
  4. At turnover phase the processing for the first operation
     will be blocked and all the events will apply to the
     new added operation that will be completed.
  

Problem conclusion

Temporary fix

Comments

• The problem was due to the fact that the IJ1 (submit event) is
  missing for job externally submitted.
  The IJ1 event contains the key needed to do the match to the
  operation in the plan to start.
  Since it is missing the operation chosen is that having the
  earlier latest start time.
  In this scenario a new occurrence is generated in the plan
  while the first occurrence started.
  Internally a new DOA is generated and put at the head of the
  DOA chain since it has an earlier Latest Start Time
  At the turnover phase all events are reapplied to this new DOA
  since it is the first in the chain
  The problem can be fixed handling a new trl record that
  substitutes the missing IJ1 and that indicates which occurrence
  the A1/B1 event is tracked against.
  

APAR Information

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

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

Fix information

Applicable component levels

• R512 PSN

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