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Posted to common-issues@hadoop.apache.org by "Chris Nauroth (JIRA)" <ji...@apache.org> on 2015/05/07 18:34:00 UTC

[jira] [Commented] (HADOOP-11935) Provide optional native implementation of stat syscall.

    [ https://issues.apache.org/jira/browse/HADOOP-11935?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14532959#comment-14532959 ] 

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

It might turn out that what we really want is {{lstat}}.  We need to review the existing {{FileSystem}} semantics and make sure we preserve that behavior.

http://linux.die.net/man/2/stat

> 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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