[jira] Updated: (HADOOP-6592) Scheduler: Pause button desirable

["Adam Kramer (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HADOOP-6592?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Adam Kramer updated HADOOP-6592:
--------------------------------

    Priority: Minor  (was: Major)

> 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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