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https://issues.apache.org/jira/browse/HADOOP-13704?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17259829#comment-17259829
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Steve Loughran commented on HADOOP-13704:
-----------------------------------------
should really fix this rather than repeated open JIRAs on fixing it
> S3A getContentSummary() to move to listFiles(recursive) to count children;
> instrument use
> -----------------------------------------------------------------------------------------
>
> Key: HADOOP-13704
> URL: https://issues.apache.org/jira/browse/HADOOP-13704
> Project: Hadoop Common
> Issue Type: Sub-task
> Components: fs/s3
> Affects Versions: 2.8.0
> Reporter: Steve Loughran
> Priority: Minor
>
> Hive and a bit of Spark use {{getContentSummary()}} to get some summary stats
> of a filesystem. This is very expensive on S3A (and any other object store),
> especially as the base implementation does the recursive tree walk.
> Because of HADOOP-13208, we have a full enumeration of files under a path
> without directory costs...S3A can/should switch to this to speed up those
> places where the operation is called.
> Also
> * API call needs FS spec and contract tests
> * S3A could instrument invocation, so as to enable real-world popularity to
> be measured
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