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https://issues.apache.org/jira/browse/MAPREDUCE-1783?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ramkumar Vadali updated MAPREDUCE-1783:
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Status: Patch Available (was: Open)
Fix Version/s: 0.22.0
> Task Initialization should be delayed till when a job can be run
> ----------------------------------------------------------------
>
> Key: MAPREDUCE-1783
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-1783
> Project: Hadoop Map/Reduce
> Issue Type: Improvement
> Components: contrib/fair-share
> Affects Versions: 0.20.1
> Reporter: Ramkumar Vadali
> Fix For: 0.22.0
>
> Attachments: 0001-Pool-aware-job-initialization.patch,
> 0001-Pool-aware-job-initialization.patch.1
>
>
> The FairScheduler task scheduler uses PoolManager to impose limits on the
> number of jobs that can be running at a given time. However, jobs that are
> submitted are initiaiized immediately by EagerTaskInitializationListener by
> calling JobInProgress.initTasks. This causes the job split file to be read
> into memory. The split information is not needed until the number of running
> jobs is less than the maximum specified. If the amount of split information
> is large, this leads to unnecessary memory pressure on the Job Tracker.
> To ease memory pressure, FairScheduler can use another implementation of
> JobInProgressListener that is aware of PoolManager limits and can delay task
> initialization until the number of running jobs is below the maximum.
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