Steve Loughran updated HADOOP-13704:
    Parent: HADOOP-15220  (was: HADOOP-14831)

> 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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