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From "Thomas Graves (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (MAPREDUCE-3483) CapacityScheduler reserves container on same node as AM but can't ever use due to never enough avail memory
Date Tue, 29 Nov 2011 21:11:39 GMT
CapacityScheduler reserves container on same node as AM but can't ever use due to never enough
avail memory
-----------------------------------------------------------------------------------------------------------

                 Key: MAPREDUCE-3483
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-3483
             Project: Hadoop Map/Reduce
          Issue Type: Bug
          Components: mrv2
    Affects Versions: 0.23.0
            Reporter: Thomas Graves
            Priority: Blocker


Saw a case where a job was stuck trying to get reducers.  The issue is the capacity scheduler
reserved a container on the same node as the application master but there wasn't ever enough
memory to run the reducer on that node.  Node total memory was 8G, Reducer needed 8G, AM was
using 2G.  This particular job had 10 reducers and it was stuck waiting on the one because
the AM + reserved reducer memory was already over the queue limit.  

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