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https://issues.apache.org/jira/browse/HADOOP-14600?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16151203#comment-16151203
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Allen Wittenauer commented on HADOOP-14600:
-------------------------------------------
You actually can run test-patch on Windows. I've got a daily job that runs on
the ASF infra now. \Program Files\Git\usr\bin has almost everything you need,
outside of cmake, protoc, maven, and whatever features you want. But there are
a lot of gotchas. Beyond that, there are a lot of problems with just using
mvn test on Windows. It's probably better just to specifically use mvn test
-Dtest=foo and test your specific foo at the moment.
> 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,
> 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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