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From "Allen Wittenauer (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (MAPREDUCE-242) TaskTracker can skip a dfs check on every task launch.
Date Fri, 18 Jul 2014 17:48:04 GMT

     [ https://issues.apache.org/jira/browse/MAPREDUCE-242?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Allen Wittenauer resolved MAPREDUCE-242.
----------------------------------------

    Resolution: Incomplete

Closing as stale.

> TaskTracker can skip a dfs check on every task launch.
> ------------------------------------------------------
>
>                 Key: MAPREDUCE-242
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-242
>             Project: Hadoop Map/Reduce
>          Issue Type: Improvement
>            Reporter: Amar Kamat
>            Assignee: Amar Kamat
>
> When tasktracker gets a new task to run, it queries the namenode to find out the job
directory _size_. This _size_ is required if the job files are not yet localized. But if its
already localized then the dfs call gets wasted. This will be true for all but 1 tasks that
run for a job on a tracker. One can avoid it but checking if the job is already localized.



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