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From "Arun C Murthy (JIRA)" <j...@apache.org>
Subject [jira] [Created] (MAPREDUCE-2694) AM releases too many containers due to the protocol
Date Fri, 15 Jul 2011 22:40:00 GMT
AM releases too many containers due to the protocol
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                 Key: MAPREDUCE-2694
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-2694
             Project: Hadoop Map/Reduce
          Issue Type: Bug
            Reporter: Arun C Murthy
            Assignee: Sharad Agarwal


- AM sends request asking 4 containers on host H1.
- Asynchronously, host H1 reaches RM and gets assigned 4 containers. RM at this point, sets
the value against H1 to
zero in its aggregate request-table for all apps.
- In the mean-while AM gets to need 3 more containers, so a total of 7 including the 4 from
previous request.
- Today, AM sends the absolute number of 7 against H1 to RM as part of its request table.
- RM seems to be overriding its earlier value of zero against H1 to 7 against H1. And thus
allocating 7 more
containers.
- AM already gets 4 in this scheduling iteration, but gets 7 more, a total of 11 instead of
the required 7.

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