Gabor Bota commented on HADOOP-14756:

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

* 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 
* 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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