[FLINK-5613] QueryableState: requesting a non-existing key in RocksDBStateBackend is not consistent with the MemoryStateBackend and FsStateBackend

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 1.2.0
• Fix Version/s: 1.2.0, 1.3.0
• Component/s: Runtime / Queryable State
• Assignee: Nico Kruber
• Reporter: Nico Kruber
• Created: 23/Jan/17 10:53
• Updated: 24/Jan/17 07:45
• Resolved: 24/Jan/17 07:45

Description

Querying for a non-existing key for a state that has a default value set currently results in the default value being returned in the RocksDBStateBackend only. MemoryStateBackend or FsStateBackend will return null which results in an UnknownKeyOrNamespace exception.

Default values are now deprecated and will be removed eventually so we should not introduce them into the new queryable state API and thus adapt the RocksDBStateBackend accordingly.

This refers to FLINK-5527 but solves the initial issues the opposite way.

Issue Links

• links to: GitHub Pull Request #3193