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From "Ryan Blue (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-12810) FileSystem#listLocatedStatus causes unnecessary RPC calls
Date Wed, 17 Feb 2016 16:41:18 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-12810?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15150751#comment-15150751
] 

Ryan Blue commented on HADOOP-12810:
------------------------------------

Thanks for reviewing and commiting this so quickly, [~vinayrpet]!

> 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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