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Posted to common-dev@hadoop.apache.org by "Ryan Blue (JIRA)" <ji...@apache.org> on 2016/02/16 23:29:18 UTC

[jira] [Created] (HADOOP-12810) FileSystem#listLocatedStatus causes unnecessary RPC calls

Ryan Blue created HADOOP-12810:
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             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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