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https://issues.apache.org/jira/browse/MAPREDUCE-6889?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16010117#comment-16010117
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Rohith Sharma K S commented on MAPREDUCE-6889:
----------------------------------------------
Pseudo code to use this API would be
{code}
// Create a new Job
Job job = Job.getInstance();
job.setJarByClass(MyJob.class);
// Specify various job-specific parameters
job.setJobName("myjob");
job.setInputPath(new Path("in"));
job.setOutputPath(new Path("out"));
job.setMapperClass(MyJob.MyMapper.class);
job.setReducerClass(MyJob.MyReducer.class);
// Submit the job, then poll for progress until the job is complete
job.waitForCompletion(true);
// Close the Job
job.close();
{code}
> FileSystem leak when Job#submit() used when ATS1.5 enabled
> ----------------------------------------------------------
>
> 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
>
>
> 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, Job class should provide a API to close the
> services very similar to JobClient#close.
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