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https://issues.apache.org/jira/browse/MAPREDUCE-5497?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13764008#comment-13764008
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Bikas Saha commented on MAPREDUCE-5497:
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Does the client service return job succeeded status after the services have
stopped or as soon as jobimpl succeeds? If we wait till after the services have
stopped, then we can be sure that the user will be notified of success only
when the job is really done. Any unexpected incident during unregister etc can
be handled internally as appropriate because the user still thinks that the job
is running. After that we can sleep for 5 secs for the user to connect and read
the status.
> '5s sleep' in MRAppMaster.shutDownJob is only needed before stopping
> ClientService
> -----------------------------------------------------------------------------------
>
> Key: MAPREDUCE-5497
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-5497
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Reporter: Jian He
> Assignee: Jian He
> Fix For: 2.1.1-beta
>
> Attachments: MAPREDUCE-5497.1.patch, MAPREDUCE-5497.1.patch,
> MAPREDUCE-5497.2.patch, MAPREDUCE-5497.patch
>
>
> Since the '5s sleep' is for the purpose to let clients know the final states,
> put it after other services are stopped and only before stopping
> ClientService is enough. This can reduce some race conditions like
> MAPREDUCE-5471
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