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https://issues.apache.org/jira/browse/HADOOP-2266?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12545943
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Michael Bieniosek commented on HADOOP-2266:
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It's possible to do this through the JobClient API currently.
> 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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