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From "Sunil G (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-6889) Provide an API Job#close to shutdown MR client services.
Date Tue, 23 May 2017 10:18:04 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-6889?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16020998#comment-16020998
] 

Sunil G commented on MAPREDUCE-6889:
------------------------------------

+1 for the patch. Thanks for correct the jira title as well.
I could commit tomorrow if there are no objections.

> 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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