[jira] [Commented] (MAPREDUCE-6760) LocatedFileStatusFetcher to use listFiles(recursive)

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

    [ https://issues.apache.org/jira/browse/MAPREDUCE-6760?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15742512#comment-15742512 ] 

Steve Loughran commented on MAPREDUCE-6760:
-------------------------------------------

one problem here is that it's using globStatus(). The code should check to see if there's a wildcard in the scan, and if not, go to the optimal API call.

Of course, if globStatus() did that check and action itself, everything which called that API would get a speedup. That could be be the better tactic

> LocatedFileStatusFetcher to use listFiles(recursive)
> ----------------------------------------------------
>
>                 Key: MAPREDUCE-6760
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-6760
>             Project: Hadoop Map/Reduce
>          Issue Type: Improvement
>          Components: mrv2
>    Affects Versions: 2.8.0
>            Reporter: Steve Loughran
>
> {{LocatedFileStatusFetcher}} does parallelized path listing, but it does make recursive calls on every subdir.
> If we could switch it to use {{FileSystem.listFiles(recursive)}}, object stores that have high-performance implementations of that operation would see significant speedup.
> HADOOP-13208 implements that for S3A; Azure, swift &c can do the same.



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