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Posted to common-issues@hadoop.apache.org by "Ping Liu (JIRA)" <ji...@apache.org> on 2017/12/01 05:47:00 UTC
[jira] [Commented] (HADOOP-14600) LocatedFileStatus constructor
forces RawLocalFS to exec a process to get the permissions
[ https://issues.apache.org/jira/browse/HADOOP-14600?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16273970#comment-16273970 ]
Ping Liu commented on HADOOP-14600:
-----------------------------------
Just verified. There is no error!
I missed {{-Pnative}} in Maven build that is required profile to generate JNI native code. Now things look good. I tried the patch on IntelliJ in both Windows and Linux and made sure seeing the code flow into the test cases.
Also tested command line console. I am attaching the command line test results from both Windows and Linux (see attachments: {{command_line_test_result__linux.txt}}, {{command_line_test_result__windows.txt}}).
cc: [~chris.douglas], [~steve_l]
> 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, command_line_test_result__linux.txt, command_line_test_result__windows.txt
>
>
> 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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