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Posted to common-issues@hadoop.apache.org by "Ping Liu (JIRA)" <ji...@apache.org> on 2017/11/05 02:06:00 UTC
[jira] [Updated] (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:all-tabpanel ]
Ping Liu updated HADOOP-14600:
------------------------------
Attachment: HADOOP-14600.006.patch
> 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, 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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