[
https://issues.apache.org/jira/browse/HADOOP-14600?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16411586#comment-16411586
]
Jonathan Eagles commented on HADOOP-14600:
------------------------------------------
[~myapachejira] Was taking a look at this exact bug I found this week while
running 2.8. Filed HADOOP-15337 to fix, but this is likely the same exactly.
It would be great to have this feature fix in 2.8, but I see this JIRA took a
vastly different approach that seems more work to backport. Did you compare the
posix file system approach implementation approach for speeds and support?
Without realizing you had already fixed this issue, I put a patch up in
HADOOP-15337 that shows the alternative implementation approach. Sorry again
for being so late to the conversation, not intending to step on toes.
> 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
> Priority: Major
> Fix For: 3.1.0
>
> 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.
--
This message was sent by Atlassian JIRA
(v7.6.3#76005)
---------------------------------------------------------------------
To unsubscribe, e-mail: [email protected]
For additional commands, e-mail: [email protected]
