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