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https://issues.apache.org/jira/browse/YARN-5939?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15705168#comment-15705168
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Weiwei Yang commented on YARN-5939:
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Hello [~lxw668899]
Thanks for reporting this, file system should be closed and leaks in FSDownload
should be fixed. I will try to submit a patch to fix this. I guess when you
have cache enabled you don't have this problem was because cache automatically
closes file system for you.
> 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
> 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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