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From "Weiwei Yang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-5939) Disabling the cache of FileSystem leads to case that never close the FileSystem
Date Wed, 30 Nov 2016 16:23:58 GMT

    [ https://issues.apache.org/jira/browse/YARN-5939?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15709021#comment-15709021

Weiwei Yang commented on YARN-5939:

Hello [~knoguchi]

Would you like to help to review this patch? Thanks a lot.

> Disabling the cache of FileSystem leads to case that never close the FileSystem
> -------------------------------------------------------------------------------
>                 Key: YARN-5939
>                 URL: https://issues.apache.org/jira/browse/YARN-5939
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: nodemanager
>    Affects Versions: 2.5.1, 2.7.3
>            Reporter: liuxiangwei
>            Assignee: Weiwei Yang
>         Attachments: YARN-5939.01.patch, YARN-5939.02.patch
>   Original Estimate: 24h
>  Remaining Estimate: 24h
> Background
> To use our self-defined FileSystem class, the item of configuration "fs.%s.impl.disable.cache"
should set to true.
> In YARN's source code, the class named "org.apache.hadoop.yarn.util.FSDownload" use getFileSystem
but never close, which leading to file descriptor leak because our self-defined FileSystem
class close the file descriptor when the close function is invoked.
> My Question below:
> 1. whether invoking "getFileSystem" but never close is YARN's expected behavior 
> 2. what should we do in our self-defined FileSystem resolve it.

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