[jira] [Created] (UIMA-4260) DUCC: RM Leave unpreemptable requests pending if can't be filled

["Jim Challenger (JIRA)" <de...@uima.apache.org>]

Jim Challenger created UIMA-4260:
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             Summary: DUCC: RM Leave unpreemptable requests pending if can't be filled
                 Key: UIMA-4260
                 URL: https://issues.apache.org/jira/browse/UIMA-4260
             Project: UIMA
          Issue Type: Improvement
          Components: DUCC
    Affects Versions: 1.1.0-Ducc
            Reporter: Jim Challenger
            Assignee: Jim Challenger
             Fix For: 2.0.0-Ducc


RM should no longer refuse requests for un-fillable un-preemptable requests and instead leave them pending.  

Use cases:
1.  Multi-step experiments that include a number of short unpreemptable steps issued in parallel.  In this case it is known that all requests will be fulfilled within a reasonable time so they should not be refused.
2.  Multiple cooperative schedulers.  In some scenarios DUCC may be able to request additional resources based on load; for example, in some cloud configurations.  In this case, we know the request may be fulfilled within a reasonable time.
 
There are cases with no assurance that sufficient resources will be made available but in practice these are rare compared to the cases above.  In these cases human intervention will be necessary.



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