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https://issues.apache.org/jira/browse/HADOOP-6592?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Allen Wittenauer resolved HADOOP-6592.
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Resolution: Won't Fix
> Scheduler: Pause button desirable
> ---------------------------------
>
> Key: HADOOP-6592
> URL: https://issues.apache.org/jira/browse/HADOOP-6592
> Project: Hadoop Common
> Issue Type: Wish
> Reporter: Adam Kramer
> Priority: Minor
>
> It would be lovely if, from the jobtracker page, I could click a button
> that's not "kill" or "fail" but ..."pause."
> The pause button would stop a certain task from starting any more mappers or
> reducers. They would all wait in the "pending" stage until the job is
> "un-paused." Currently-running tasks would continue to run, and then
> complete, thus freeing the resources for other jobs.
> This would help a lot for systems (esp. Hive) in which one or two jobs are
> hogging a lot of mappers or reducers. The ones they have would finish, and
> then other jobs could "catch up," and then they could be unpaused for a
> while. This would also allow for user-level throttling of their jobs in
> instances where they need a lot of resources but have the time to spare.
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