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https://issues.apache.org/jira/browse/MAPREDUCE-1227?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12780769#action_12780769
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Arun C Murthy commented on MAPREDUCE-1227:
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What about jobs which are already running?
Also, what you really want is the ability to run jobs from some queues (e.g.
admin queue) and pause all the other queues. So, this feature isn't really
going to buy you much. Ability to pause queues is a much more general solution
- I believe the CapacityScheduler already implements this, hence this is more
of a scheduler property.
> Allow JobTracker to pause task scheduling
> -----------------------------------------
>
> Key: MAPREDUCE-1227
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-1227
> Project: Hadoop Map/Reduce
> Issue Type: New Feature
> Affects Versions: 0.22.0
> Reporter: Dmytro Molkov
>
> We want to have an ability to pause task scheduling in JobTracker.
> The idea is: make job tracker still accept new jobs, but delay their running
> and do not schedule any new tasks from the currently running jobs.
> It will help for example restarting the DFS cluster without affecting jobs:
> pause execution, restart the DFS, running tasks will fail, but will not be
> scheduled until the execution is resumed, so the job does not fail.
> In general it should help fix non MR problems (DFS, network, etc.) while not
> failing running jobs and keep accepting new ones.
> What do people think of the general idea?
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