Sunil G updated MAPREDUCE-6889:
    Summary: Add Job#close API to shutdown MR client services.  (was: Provide 
an API Job#close to shutdown MR client services.)

> Add Job#close API 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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