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From "Ping Liu (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-14600) LocatedFileStatus constructor forces RawLocalFS to exec a process to get the permissions
Date Tue, 28 Nov 2017 04:27:00 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-14600?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16268098#comment-16268098
] 

Ping Liu commented on HADOOP-14600:
-----------------------------------

Yes, Chris.  I am verifying the patch.  There is an issue just found tonight in my Linux environment.
 In TestRawLocalFileSystemContract.testPermission(), the native call failed with {{java.lang.UnsatisfiedLinkError:
org.apache.hadoop.io.nativeio.NativeIO$POSIX.stat(Ljava/lang/String;)Lorg/apache/hadoop/io/nativeio/NativeIO$POSIX$Stat;}}.
 I'll look into it further.  I guess it is due to my last change.  I'll come back with update.

> LocatedFileStatus constructor forces RawLocalFS to exec a process to get the permissions
> ----------------------------------------------------------------------------------------
>
>                 Key: HADOOP-14600
>                 URL: https://issues.apache.org/jira/browse/HADOOP-14600
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: fs
>    Affects Versions: 2.7.3
>         Environment: file:// in a dir with many files
>            Reporter: Steve Loughran
>            Assignee: Ping Liu
>         Attachments: HADOOP-14600.001.patch, HADOOP-14600.002.patch, HADOOP-14600.003.patch,
HADOOP-14600.004.patch, HADOOP-14600.005.patch, HADOOP-14600.006.patch, HADOOP-14600.007.patch,
HADOOP-14600.008.patch, HADOOP-14600.009.patch, TestRawLocalFileSystemContract.java
>
>
> Reported in SPARK-21137. a {{FileSystem.listStatus}} call really craws against the local
FS, because {{FileStatus.getPemissions}} call forces  {{DeprecatedRawLocalFileStatus}} tp
spawn a process to read the real UGI values.
> That is: for every other FS, what's a field lookup or even a no-op, on the local FS it's
a process exec/spawn, with all the costs. This gets expensive if you have many files.



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