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

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

    [ https://issues.apache.org/jira/browse/HADOOP-14756?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16150551#comment-16150551 ] 

Steve Loughran commented on HADOOP-14756:
-----------------------------------------

the new getDiagnostics() call in HADOOP-14220 provides a string -> string map of diagnostics info to callers; I'm already using this for the functional tests of set-capacity by having standard name for read-capacity and write-capacity. Authoritative -> bool would be another field and used the same way...no need to put in another method

> 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: HADOOP-13345
>            Reporter: Steve Loughran
>             Fix For: HADOOP-13345
>
>
> {{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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