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https://issues.apache.org/jira/browse/HADOOP-16468?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Steve Loughran resolved HADOOP-16468.
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Fix Version/s: hadoop-13704
Resolution: Duplicate
> S3AFileSystem.getContentSummary() to use listFiles(recursive)
> -------------------------------------------------------------
>
> Key: HADOOP-16468
> URL: https://issues.apache.org/jira/browse/HADOOP-16468
> Project: Hadoop Common
> Issue Type: Sub-task
> Components: fs, fs/s3
> Affects Versions: 3.2.0
> Reporter: Steve Loughran
> Priority: Major
> Fix For: hadoop-13704
>
>
> HIVE-22054 discusses how they use getContentSummary to see if a directory is
> empty.
> This is implemented in FileSystem as a recursive treewalk, with all the costs
> there.
> Hive is moving off it; once that is in it won't be so much of an issue. But
> if we wanted to speed up older versions of Hive, we could move the operation
> to using a flat list
> That would give us the file size rapidly; the directory count would have to
> be worked out by tracking parent dirs of all paths (and all entries ending
> with /), and adding them up
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