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