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From "Vinod Kumar Vavilapalli (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-4749) Killing multiple attempts of a task taker longer as more attempts are killed
Date Tue, 30 Oct 2012 21:12:12 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-4749?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13487242#comment-13487242

Vinod Kumar Vavilapalli commented on MAPREDUCE-4749:

We can fix this by not waiting at all. Because we are requeueing the event, other actions
won't be blocked so MAPREDUCE-4088 remains fixed.

Existing test will continue to work, we can also verify that killing multiple attempts doesn't
take longer. Arpit, want to take this up?
> Killing multiple attempts of a task taker longer as more attempts are killed
> ----------------------------------------------------------------------------
>                 Key: MAPREDUCE-4749
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-4749
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>    Affects Versions: 1.1.0
>            Reporter: Arpit Gupta
>            Assignee: Vinod Kumar Vavilapalli
> The following was noticed on a mr job running on hadoop 1.1.0
> 1. Start an mr job with 1 mapper
> 2. Wait for a min
> 3. Kill the first attempt of the mapper and then subsequently kill the other 3 attempts
in order to fail the job
> The time taken to kill the task grew exponentially.
> 1st attempt was killed immediately.
> 2nd attempt took a little over a min
> 3rd attempt took approx. 20 mins
> 4th attempt took around 3 hrs.
> The command used to kill the attempt was "hadoop job -fail-task"
> Note that the command returned immediately as soon as the fail attempt was accepted but
the time the attempt was actually killed was as stated above.

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