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From "Bikas Saha (JIRA)" <j...@apache.org>
Subject [jira] [Created] (MAPREDUCE-4671) AM does not tell the RM about container requests that are no longer needed
Date Thu, 20 Sep 2012 23:01:07 GMT
Bikas Saha created MAPREDUCE-4671:
-------------------------------------

             Summary: AM does not tell the RM about container requests that are no longer
needed
                 Key: MAPREDUCE-4671
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-4671
             Project: Hadoop Map/Reduce
          Issue Type: Bug
            Reporter: Bikas Saha
            Assignee: Bikas Saha


Say the AM wanted a container at hosts h1, h2, h3. After getting a container at h1 it should
tell RM that it no longer needs containers at h2, h3. Otherwise on the RM h2, h3 remain valid
allocation locations.
The AM RMContainerAllocator does remove these resource requests internally. When the resource
request container count drops to 0 then it drops the resource request from its tables but
forgets to send the 0 sized request to the RM.

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