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https://issues.apache.org/jira/browse/HADOOP-3687?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12610514#action_12610514
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Amar Kamat commented on HADOOP-3687:
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bq. In the current framework, you might make a command that lowers the priority
of a job and kills any task that is still running N minutes later. That would
be easy to do and have the right effect, wouldn't it?
Wouldn't HADOOP-3444 introduce this (pre-emption)? Unless we decide to
implement pre-emption earlier and modify it to cater the scheduling needs.
> 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
> Priority: Minor
>
> 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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