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https://issues.apache.org/jira/browse/HADOOP-2266?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12545356
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Enis Soztutar commented on HADOOP-2266:
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bq. 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.
I remember this was discussed before but never implemented. I think this and a
command to gracefully stop the jt would be great.
> 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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