IZ3212: default_duration INFINITY in scheduler shouldn't start backfilling

[reuti]

[Imported from gridengine issuezilla ​http://gridengine.sunsource.net/issues/show_bug.cgi?id=3212]

        Issue #:      3212             Platform:     Macintosh   Reporter: reuti (reuti)
       Component:     gridengine          OS:        All
     Subcomponent:    scheduling       Version:      6.2u4          CC:    None defined
        Status:       NEW              Priority:     P3
      Resolution:                     Issue type:    DEFECT
                                   Target milestone: ---
      Assigned to:    andreas (andreas)
      QA Contact:     andreas
          URL:
       * Summary:     default_duration INFINITY in scheduler shouldn't start backfilling
   Status whiteboard:
      Attachments:

     Issue 3212 blocks:
   Votes for issue 3212:


   Opened: Wed Dec 9 12:58:00 -0700 2009 
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Observed behavior:

- submit jobs with no h_rt requested but request a consumable resource
- the last job will in addition request a complex with high urgency, resource reservation and a huge amount of the consumable resource
- this last job will skip to top of waiting jobs, but smaller requests always slip in from the former jobs

Giving every job a dedicated runtime of 5 minutes gives the expected behavior: last job will reserve the consumable resource.

The problem might be in the default_duration being INFINITY and other jobs which also are seen with an estimated runtime of INIFINTY are
allowed to start backfilling.

There should be a different entry UNDEFINED (maybe also as value for -l h_rt=). Other UNDEFINED jobs shouldn't be eligible for backfilling
to avoid starvation in the default configuration.

They can of course be scheduled when there was a job submitted with an explicit -l h_rt=INFINITY.

Workaround for now: set the default_duration to 9999:00:00 instead of INFINITY