[jira] [Created] (HADOOP-14600) LocatedFileStatus constructor forces RawLocalFS to exec a process to get the permissions

["Steve Loughran (JIRA)" <ji...@apache.org>]

Steve Loughran created HADOOP-14600:
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             Summary: 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


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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