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https://issues.apache.org/jira/browse/HADOOP-2266?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12545237
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Owen O'Malley commented on HADOOP-2266:
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Another approach to this would be to have an admin command for the job tracker
that would have the job tracker stop accepting new jobs and shut itself down
when the last job completed. That way the external process wouldn't need to
continually poll the job tracker to see if it was done yet. Thoughts?
> Provide a command line option to check if a Hadoop jobtracker is idle
> ---------------------------------------------------------------------
>
> Key: HADOOP-2266
> URL: https://issues.apache.org/jira/browse/HADOOP-2266
> Project: Hadoop
> Issue Type: New Feature
> Components: mapred
> Reporter: Hemanth Yamijala
> Fix For: 0.16.0
>
>
> This is an RFE for providing a way to determine from the hadoop command line
> whether a jobtracker is idle. One possibility is to have something like
> hadoop jobtracker -idle <time>. Hadoop would return true (maybe via some
> stdout output) if the jobtracker had no work to do (jobs running / prepared)
> since <time> seconds, false otherwise.
> This would be useful for management / provisioning systems like
> Hadoop-On-Demand [HADOOP-1301], which can then deallocate the idle,
> provisioned clusters automatically, and release resources.
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