Steve Loughran created HADOOP-13704:
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Summary: 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
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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