[jira] [Assigned] (HADOOP-13704) S3A getContentSummary() to move to listFiles(recursive) to count children; instrument use

["Steve Loughran (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HADOOP-13704?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Steve Loughran reassigned HADOOP-13704:
---------------------------------------

    Assignee: Ahmar Suhail

> 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
>            Assignee: Ahmar Suhail
>            Priority: Minor
>              Labels: pull-request-available
>          Time Spent: 3h
>  Remaining Estimate: 0h
>
> 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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