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From "Allen Wittenauer (JIRA)" <j...@apache.org>
Subject [jira] Commented: (MAPREDUCE-1227) Allow JobTracker to pause task scheduling
Date Fri, 20 Nov 2009 22:55:39 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-1227?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12780807#action_12780807

Allen Wittenauer commented on MAPREDUCE-1227:

Many tasks write to HDFS as well as read, so those would need to have some way to be paused.
 This is particularly interesting when thinking about a streaming job.

But isn't the same functionality available if all of the task trackers are down?  [I've never
tried it.]

> 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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