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https://issues.apache.org/jira/browse/MAPREDUCE-3566?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Vinod Kumar Vavilapalli updated MAPREDUCE-3566:
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Attachment: MAPREDUCE-3566-20111215.txt
A very raw patch that I was using during the performance testing.
Will clean it up and add tests if any possible.
> MR AM slows down due to repeatedly constructing ContainerLaunchContext
> ----------------------------------------------------------------------
>
> Key: MAPREDUCE-3566
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-3566
> Project: Hadoop Map/Reduce
> Issue Type: Sub-task
> Components: mr-am, mrv2
> Affects Versions: 0.23.0
> Reporter: Vinod Kumar Vavilapalli
> Assignee: Vinod Kumar Vavilapalli
> Fix For: 0.23.1
>
> Attachments: MAPREDUCE-3566-20111215.txt
>
>
> 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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