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From "Ryan Blue (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HADOOP-12810) FileSystem#listLocatedStatus causes unnecessary RPC calls
Date Tue, 16 Feb 2016 22:29:18 GMT
Ryan Blue created HADOOP-12810:

             Summary: FileSystem#listLocatedStatus causes unnecessary RPC calls
                 Key: HADOOP-12810
                 URL: https://issues.apache.org/jira/browse/HADOOP-12810
             Project: Hadoop Common
          Issue Type: Bug
          Components: fs, fs/s3
    Affects Versions: 2.7.2
            Reporter: Ryan Blue
            Assignee: Ryan Blue

{{FileSystem#listLocatedStatus}} lists the files in a directory and then calls {{getFileBlockLocations(stat.getPath(),
...)}} for each instead of {{getFileBlockLocations(stat, ...)}}. That function with the path
arg just calls {{getFileStatus}} to get another file status from the path and calls the file
status version, so this ends up calling {{getFileStatus}} unnecessarily.

This is particularly bad for S3, where {{getFileStatus}} is expensive. Avoiding the extra
call improved input split calculation time for a data set in S3 by ~20x: from 10 minutes to
25 seconds.

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