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From "Chris Douglas (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HADOOP-14600) LocatedFileStatus constructor forces RawLocalFS to exec a process to get the permissions
Date Thu, 16 Nov 2017 23:14:00 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-14600?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Chris Douglas updated HADOOP-14600:
-----------------------------------
    Attachment: HADOOP-14600.007.patch

Thanks for being patient with the reviews, [~myapachejira]. I made a few changes to the patch,
almost all to make the patch adhere to the [code conventions|http://www.oracle.com/technetwork/java/javase/documentation/codeconvtoc-136057.html]
([wiki|https://wiki.apache.org/hadoop/HowToContribute]).

Could you take a look and make sure this didn't accidentally break your changes? The only
intended functional change was to {{Helper}} (renamed {{StatUtils}}), to use the {{recursive}}
parameter. It looks like this was accidentally unused.

> 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,
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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