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From "Aaron Fabbri (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-13914) s3guard: improve S3AFileStatus#isEmptyDirectory handling
Date Mon, 09 Jan 2017 23:50:58 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-13914?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15813249#comment-15813249
] 

Aaron Fabbri commented on HADOOP-13914:
---------------------------------------

Thanks for uploading an RFC patch [~liuml07].  
Did you have a chance to read [the doc|https://gist.github.com/ajfabbri/db3b2ad5b1f111277681ba4b7f788404]
I attached here?  If I'm reading this patch right, the test case I attached to this JIRA would
not pass.  

In particular, my doc asserts that MetadataStore#isEmptyDirectory would need to return a tristate,
not a boolean, as it can answer {yes, no, not enough information}.


> s3guard: improve S3AFileStatus#isEmptyDirectory handling
> --------------------------------------------------------
>
>                 Key: HADOOP-13914
>                 URL: https://issues.apache.org/jira/browse/HADOOP-13914
>             Project: Hadoop Common
>          Issue Type: Sub-task
>          Components: fs/s3
>    Affects Versions: HADOOP-13345
>            Reporter: Aaron Fabbri
>            Assignee: Mingliang Liu
>         Attachments: HADOOP-13914-HADOOP-13345.000.patch, s3guard-empty-dirs.md, test-only-HADOOP-13914.patch
>
>
> As discussed in HADOOP-13449, proper support for the isEmptyDirectory() flag stored in
S3AFileStatus is missing from DynamoDBMetadataStore.
> The approach taken by LocalMetadataStore is not suitable for the DynamoDB implementation,
and also sacrifices good code separation to minimize S3AFileSystem changes pre-merge to trunk.
> I will attach a design doc that attempts to clearly explain the problem and preferred
solution.  I suggest we do this work after merging the HADOOP-13345 branch to trunk, but am
open to suggestions.
> I can also attach a patch of a integration test that exercises the missing case and demonstrates
a failure with DynamoDBMetadataStore.



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