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

["Chris Trezzo (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HADOOP-12810?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15433306#comment-15433306 ] 

Chris Trezzo commented on HADOOP-12810:
---------------------------------------

Adding 2.6.5 to the target versions with the intention of backporting this to branch-2.6. We would also backport the associated MAPREDUCE-6637 for the test fix. Please let me know if you think otherwise. Thanks!

> 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
>             Fix For: 2.7.3
>
>         Attachments: HADOOP-12810.1.patch
>
>
> {{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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