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https://issues.apache.org/jira/browse/HADOOP-4038?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12626225#action_12626225
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Pete Wyckoff commented on HADOOP-4038:
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should we just describe this as ability for admin to stop the JT from accepting
new jobs and re-enable accepting new jobs?? would be nice if the caller is able
to detect this and handle appropriately - i.e., the JobClient can pause until
the JT is ready.
also need an API getAcceptingJobsState();
> Ability for JobTracker to drain running jobs before a shutdown
> --------------------------------------------------------------
>
> Key: HADOOP-4038
> URL: https://issues.apache.org/jira/browse/HADOOP-4038
> Project: Hadoop Core
> Issue Type: Improvement
> Components: mapred
> Reporter: dhruba borthakur
>
> It would be nice to have operating controls on the JobTracker that lets new
> jobs to get rejected while continuing to process existing jobs. This is handy
> while shutting down the JobTracker.
> Similarly, while restarting the JobTracker, it woudl be nice if it can go
> into this state where it refuses to accept new jobs. It allows the system
> administrator to ensure that all relevant TaskTrackers have joined the
> cluster before the cluster is opened for general use.
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