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From "Vinod Kumar Vavilapalli (JIRA)" <j...@apache.org>
Subject [jira] Created: (HADOOP-3376) [HOD] HOD should have a way to detect and deal with clusters that violate/exceed resource manager limits
Date Tue, 13 May 2008 05:04:55 GMT
[HOD] HOD should have a way to detect and deal with clusters that violate/exceed resource manager
limits
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                 Key: HADOOP-3376
                 URL: https://issues.apache.org/jira/browse/HADOOP-3376
             Project: Hadoop Core
          Issue Type: Bug
          Components: contrib/hod
            Reporter: Vinod Kumar Vavilapalli
            Assignee: Hemanth Yamijala


Currently If we set up resource manager/scheduler limits on the jobs submitted, any HOD cluster
that exceeds/violates these limits may 1) get blocked/queued indefinitely or 2) blocked till
resources occupied by old clusters get freed. HOD should detect these scenarios and deal intelligently,
instead of just waiting for a long time/ for ever. This means more and proper information
to the submitter.

(Internal) Use Case:
     If there are no resource limits, users can flood the resource manager queue preventing
other users from using the queue. To avoid this, we could have various types of limits setup
in either resource manager or a scheduler - max node limit in torque(per job limit), maxproc
limit in maui (per user/class), maxjob limit in maui(per user/class) etc. But there is one
problem with the current setup - for e.g if we set up maxproc limit in maui to limit the aggregate
number of nodes by any user over all jobs, 1) jobs get queued indefinitely if jobs exceed
max limit and 2) blocked if it asks for nodes < max limit, but some of the resources are
already used by jobs from the same user. This issue addresses how to deal with scenarios like
these.

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