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From "Adam Kramer (JIRA)" <j...@apache.org>
Subject [jira] Created: (HADOOP-6592) Scheduler: Pause button desirable
Date Tue, 23 Feb 2010 06:37:28 GMT
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


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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