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Date: Wed, 31 Oct 2012 21:47:12 +0000 (UTC)
From: "Vinod Kumar Vavilapalli (JIRA)" <jira@apache.org>
To: mapreduce-issues@hadoop.apache.org
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Subject: [jira] [Commented] (MAPREDUCE-4749) Killing multiple attempts of a
 task taker longer as more attempts are killed
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    [ https://issues.apache.org/jira/browse/MAPREDUCE-4749?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13488259#comment-13488259 ] 

Vinod Kumar Vavilapalli commented on MAPREDUCE-4749:
----------------------------------------------------

Even if we do the wait only for jobs that are localizing, the queue still gets stuck and the bug at MAPREDUCE-4088 reappears.

Let's call actions that correspond to jobs that are localizing as tainted-actions. The tight loop will result only when *ALL* the present actions in the queue are tainted. Which should be a rare case. Even this rare case can be fixed by keeping track of the tainted actions in a separate queue.
                
> 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: Arpit Gupta
>         Attachments: MAPREDUCE-4749.branch-1.patch
>
>
> 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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