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From "Steve Loughran (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HADOOP-13704) S3A getContentSummary() to move to listFiles(recursive) to count children; instrument use
Date Mon, 10 Oct 2016 16:44:20 GMT
Steve Loughran created HADOOP-13704:
---------------------------------------

             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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