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From "Rohith Sharma K S (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-6889) FileSystem leak when Job#submit() used when ATS1.5 enabled
Date Mon, 15 May 2017 07:53:04 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-6889?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16010117#comment-16010117
] 

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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