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https://issues.apache.org/jira/browse/HADOOP-4350?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12637070#action_12637070
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Amar Kamat commented on HADOOP-4350:
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HADOOP-3687 will be useful to HADOOP-4350. When a _job- pause_ is issued, we
should ideally pause the tasks also instead of killing or waiting for their
completion. But with scheduler in the picture, there will be lot of jobs
running simultaneously and hence killing the current wave of tasks for a job
should not affect the job as such.
> Ability to pause/resume jobs
> ----------------------------
>
> Key: HADOOP-4350
> URL: https://issues.apache.org/jira/browse/HADOOP-4350
> Project: Hadoop Core
> Issue Type: New Feature
> Components: mapred
> Reporter: Amar Kamat
> Assignee: Amar Kamat
>
> Consider a case where the user job depends on some external entity/service
> like a database or a web service. If the service needs restart or encounters
> a failure, the user should be able to pause the job and resume only when the
> service is up. This will be better than re-executing the whole job. Hence
> there should be some way to pause/resume jobs (from web-ui/command line) etc.
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