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From "Vinod Kumar Vavilapalli (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (MAPREDUCE-3805) MR AM not respecting MaxReduceRampUpLimit
Date Fri, 03 Feb 2012 23:53:53 GMT
MR AM not respecting MaxReduceRampUpLimit
-----------------------------------------

                 Key: MAPREDUCE-3805
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-3805
             Project: Hadoop Map/Reduce
          Issue Type: Bug
          Components: mr-am, mrv2
    Affects Versions: 0.23.0
            Reporter: Vinod Kumar Vavilapalli
             Fix For: 0.23.1


While running GridMixV3 with high memory reduces, we ran into issues where for jobs with significant
number of maps and reduces, when the map progress hits 98-99% but still there are maps pending,
reduces get every new container that RM allocates. And the job takes much longer time than
with usual reduces.

For addressing precisely these issues, a configurable limit was introduced to limit the reduce
ramp up. Unfortunately this limit is not working correctly.

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