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https://issues.apache.org/jira/browse/HADOOP-3687?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12613366#action_12613366
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Andrzej Bialecki commented on HADOOP-3687:
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I think it would be good to add to the Task interface something like onPause()
/ onUnpause() methods. This way map / reduce tasks to be paused could prepare
for this event (e.g. close DB conections or close the side-effect files), and
similarly restore their state on un-pause.
> Ability to pause/resume tasks
> -----------------------------
>
> Key: HADOOP-3687
> URL: https://issues.apache.org/jira/browse/HADOOP-3687
> Project: Hadoop Core
> Issue Type: New Feature
> Components: mapred
> Reporter: Chris Smith
> Assignee: Chris Smith
> Priority: Minor
> Attachments: hadoop-pausing.8.trunk.patch
>
>
> It would be nice to be able to pause (and subsequently resume) tasks that are
> currently running, in order to allow tasks from higher priority jobs to
> execute. At present it is quite easy for long-running tasks from low priority
> jobs to block a task from a newer high priority job, and there is no way to
> force the execution of the high priority task without killing the low
> priority jobs.
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