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https://issues.apache.org/jira/browse/YARN-3549?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14528750#comment-14528750
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Junping Du commented on YARN-3549:
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bq. but that code already exists.
I see. Thanks [~cnauroth] for clarifying on this.

> use JNI-based FileStatus implementation from 
> io.nativeio.NativeIO.POSIX#getFstat instead of shell-based implementation 
> from RawLocalFileSystem in checkLocalDir.
> ----------------------------------------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: YARN-3549
>                 URL: https://issues.apache.org/jira/browse/YARN-3549
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: nodemanager
>            Reporter: zhihai xu
>            Assignee: zhihai xu
>
> Use JNI-based FileStatus implementation from 
> io.nativeio.NativeIO.POSIX#getFstat instead of shell-based implementation 
> from RawLocalFileSystem in checkLocalDir.
> As discussed in YARN-3491, shell-based implementation getPermission runs 
> shell command "ls -ld" to get permission, which take 4 or 5 ms(very slow).
> We should switch to io.nativeio.NativeIO.POSIX#getFstat as implementation in 
> RawLocalFileSystem to get rid of shell-based implementation for FileStatus.



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