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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