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Posted to mapreduce-issues@hadoop.apache.org by "Sunil G (JIRA)" <ji...@apache.org> on 2017/07/17 08:01:00 UTC
[jira] [Commented] (MAPREDUCE-6889) Provide an API Job#close to
shutdown MR client services.
[ https://issues.apache.org/jira/browse/MAPREDUCE-6889?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16089458#comment-16089458 ]
Sunil G commented on MAPREDUCE-6889:
------------------------------------
Committing shortly.
> Provide an API Job#close to shutdown MR client services.
> --------------------------------------------------------
>
> Key: MAPREDUCE-6889
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-6889
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Reporter: Rohith Sharma K S
> Assignee: Rohith Sharma K S
> Attachments: MAPREDUCE-6889.0001.patch, MAPREDUCE-6889.0002.patch
>
>
> ATS1.5 uses FileSystemTimelineWriter which creates FS object on every writer initialization. If writer is not closed, then there is possibility of OOM see YARN-5438 fixes closing FS object.
> TimelineClient is used by YarnClient. So all the user who uses YarnClient with ATS1.5 need to stop service properly. Otherwise there is big chance of FS object leak.
> Of course MR uses YARN client submit job. If MR do not stop YarnClient then there is FS object leak.
> JobClient provides a API to stop all these service using *JobClient#close*. But many MR clients uses *Job* object to submit a job. But do not stop started services by default.
> So, provide a API *Job#close* to shutdown MR client services. This API can be utilized by caller explicitly to stop service which avoids FS leak.
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