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Date: Sat, 21 Nov 2009 02:19:39 +0000 (UTC)
From: "Arun C Murthy (JIRA)" <jira@apache.org>
To: mapreduce-issues@hadoop.apache.org
Subject: [jira] Commented: (MAPREDUCE-1227) Allow JobTracker to pause task
 scheduling
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    [ https://issues.apache.org/jira/browse/MAPREDUCE-1227?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12780890#action_12780890 ] 

Arun C Murthy commented on MAPREDUCE-1227:
------------------------------------------

bq. Doing it on a scheduler level sounds like a good idea, but the killing of the currently running tasks should be there too.

I think we agree, should I close this as 'WONTFIX' ?

> Allow JobTracker to pause task scheduling
> -----------------------------------------
>
>                 Key: MAPREDUCE-1227
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-1227
>             Project: Hadoop Map/Reduce
>          Issue Type: New Feature
>    Affects Versions: 0.22.0
>            Reporter: Dmytro Molkov
>
> We want to have an ability to pause task scheduling in JobTracker.
> The idea is: make job tracker still accept new jobs, but delay their running and do not schedule any new tasks from the currently running jobs.
> It will help for example restarting the DFS cluster without affecting jobs: pause execution, restart the DFS, running tasks will fail, but will not be scheduled until the execution is resumed, so the job does not fail.
> In general it should help fix non MR problems (DFS, network, etc.) while not failing running jobs and keep accepting new ones.
> What do people think of the general idea?

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