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

• Type: Sub-task
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 3.0.0-beta1
• Fix Version/s: 3.2.0
• Component/s: fs/s3
• Target Version/s: 3.2.0
• Assignee: Gabor Bota
• Reporter: Steve Loughran
• Created: 11/Aug/17 12:16
• Updated: 23/Apr/18 22:28
• Resolved: 23/Apr/18 22:28

Description

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

1. Add predicate to MetadataStore interface supportsAuthoritativeDirectories() or similar
2. If #1 is true, assert that directory is fully cached after changes
3. Add "isNew" flag to MetadataStore.put(DirListingMetadata); use to verify when changes are made