You are viewing a plain text version of this content. The canonical link for it is here.
Posted to mapreduce-issues@hadoop.apache.org by "Rohith Sharma K S (JIRA)" <ji...@apache.org> on 2017/05/16 15:32:04 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=16012589#comment-16012589 ]
Rohith Sharma K S commented on MAPREDUCE-6889:
----------------------------------------------
Just for curiosity, many folks including me get general doubt that, why FileSystemTimelineWriter did not implement *FileSystem#get()* that uses cache rather than FileSystem#newInstance() which creates new object?
One reason I would think Is for making independent TimelineClient so that closing FS object in JVM should not impact TimelineClient. Is my thought right?
> 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
>
>
> 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.
--
This message was sent by Atlassian JIRA
(v6.3.15#6346)
---------------------------------------------------------------------
To unsubscribe, e-mail: mapreduce-issues-unsubscribe@hadoop.apache.org
For additional commands, e-mail: mapreduce-issues-help@hadoop.apache.org