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From "Vinod Kumar Vavilapalli (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (MAPREDUCE-3566) MR AM slows down due to repeatedly constructing ContainerLaunchContext
Date Thu, 15 Dec 2011 19:57:31 GMT
MR AM slows down due to repeatedly constructing ContainerLaunchContext
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                 Key: MAPREDUCE-3566
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-3566
             Project: Hadoop Map/Reduce
          Issue Type: Bug
          Components: mr-am, mrv2
    Affects Versions: 0.23.0
            Reporter: Vinod Kumar Vavilapalli
            Assignee: Vinod Kumar Vavilapalli
             Fix For: 0.23.1


The construction of the context is expensive, includes per-task trips to NameNode for obtaining
the information about job.jar, job splits etc which is redundant across all tasks.

We should have a common job-level context and a task-specific context inheriting from the
common job-level context.

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