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From "Chris Nauroth (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-11935) Provide optional native implementation of stat syscall.
Date Thu, 07 May 2015 17:51:00 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-11935?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14533079#comment-14533079
] 

Chris Nauroth commented on HADOOP-11935:
----------------------------------------

[~gopalv], thanks for the pointer to getting lstat-like behavior through java.nio.file.

The last time I tested, the java.nio.file classes were incapable of returning a POSIX permissions
view on Windows.  It would throw an unchecked exception.  I suspect we'll still need a native
code path for Windows, where we can call through to our existing libwinutils implementation
of the mapping from NTFS ACLs to POSIX permissions.

Maybe we can get away without a native code path for Linux though.  Thanks for the suggestion.

> Provide optional native implementation of stat syscall.
> -------------------------------------------------------
>
>                 Key: HADOOP-11935
>                 URL: https://issues.apache.org/jira/browse/HADOOP-11935
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: fs, native
>            Reporter: Chris Nauroth
>
> Currently, {{RawLocalFileSystem.DeprecatedRawLocalFileStatus#loadPermissionInfo}} is
implemented as forking an {{ls}} command and parsing the output.  This was observed to be
a bottleneck in YARN-3491.  This issue proposes an optional native implementation of a {{stat}}
syscall through JNI.  We would maintain the existing code as a fallback for systems where
the native code is not available.



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