[jira] [Commented] (HADOOP-14756) S3Guard: expose capability query in MetadataStore and add tests of authoritative mode

["Gabor Bota (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HADOOP-14756?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16430890#comment-16430890 ] 

Gabor Bota commented on HADOOP-14756:
-------------------------------------

Hi [~fabbri], [~stevel@apache.org],
I've started progress on this issue, and I have some questions about it.

#3: 
* In case the "isNew" flag implementation is needed I assume it would be an additional attribute in dynamodb table for the entries. Is this correct?
* Right now there is a comment about it in org/apache/hadoop/fs/s3a/s3guard/LocalMetadataStore.java:246 - Is it still valid?
* As [~fabbri] said, as the DirListingMetadata supports the isAuthoritative flag there is no need for this change. Could it be removed from the description?



> S3Guard: expose capability query in MetadataStore and add tests of authoritative mode
> -------------------------------------------------------------------------------------
>
>                 Key: HADOOP-14756
>                 URL: https://issues.apache.org/jira/browse/HADOOP-14756
>             Project: Hadoop Common
>          Issue Type: Sub-task
>          Components: fs/s3
>    Affects Versions: 3.0.0-beta1
>            Reporter: Steve Loughran
>            Assignee: Gabor Bota
>            Priority: Major
>
> {{MetadataStoreTestBase.testListChildren}} would be improved with the ability to query the features offered by the store, and the outcome of {{put()}}, so probe the correctness of the authoritative mode
> # Add predicate to MetadataStore interface  {{supportsAuthoritativeDirectories()}} or similar
> # If #1 is true, assert that directory is fully cached after changes
> # Add "isNew" flag to MetadataStore.put(DirListingMetadata); use to verify when changes are made



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