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From "Siddharth Seth (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (MAPREDUCE-3490) RMContainerAllocator counts failed maps towards Reduce ramp up
Date Thu, 01 Dec 2011 01:17:39 GMT
RMContainerAllocator counts failed maps towards Reduce ramp up
--------------------------------------------------------------

                 Key: MAPREDUCE-3490
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-3490
             Project: Hadoop Map/Reduce
          Issue Type: Bug
          Components: mr-am, mrv2
    Affects Versions: 0.23.0
            Reporter: Siddharth Seth


The RMContainerAllocator does not differentiate between failed and successful maps while calculating
whether reduce tasks are ready to launch. Failed tasks are also counted towards total completed
tasks. 
Example. 4 failed maps, 10 total maps. Map%complete = 4/14 * 100 instead of being 0.

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