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From "Adam Kramer (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-6592) Scheduler: Pause button desirable
Date Tue, 23 Feb 2010 06:51:28 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-6592?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12837109#action_12837109
] 

Adam Kramer commented on HADOOP-6592:
-------------------------------------

Similarly, if paused during the map phase, any reducers already allocated (which couldn't,
in theory, begin working until all mappers complete) would be killed and freed. (so yes, the
copy would need to restart, but the reducers wouldn't be held hostage by huge map tasks).

> 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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