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https://issues.apache.org/jira/browse/HADOOP-1901?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12528518
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Senthil Subramanian commented on HADOOP-1901:
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stopTracker() calls close() and we want to put the cleanup code for all the
systems started by JobTracker under here. We are working on a patch that logs
hadoop metrics data into DFS using a simon aggregator that is launched by the
JobTracker and this aggregator needs to be shutdown properly for it to close
the DFS file (to make the file visible). There might be other use cases as well
where people want to commit something before exit for a clean shutdown.
> JobTracker.stopTracker() is not invoked when shutting down JobTracker using
> bin/stop-{all,mapred}.sh
> ----------------------------------------------------------------------------------------------------
>
> Key: HADOOP-1901
> URL: https://issues.apache.org/jira/browse/HADOOP-1901
> Project: Hadoop
> Issue Type: Bug
> Components: mapred
> Reporter: Senthil Subramanian
> Assignee: Senthil Subramanian
> Attachments: HADOOP-1901.patch
>
>
> This can be fixed by adding a shutdown hook to the JobTracker RunTime that
> invokes stopTracker().
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