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Posted to common-dev@hadoop.apache.org by "Adam Kramer (JIRA)" <ji...@apache.org> on 2010/02/23 07:37:28 UTC

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

Scheduler: Pause button desirable
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                 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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