[FLINK-3360] Clear up StateBackend, AbstractStateBackend abstractions

• Type: Improvement
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Fix Version/s: 1.3.0
• Component/s: API / DataStream
• Assignee: Unassigned
• Reporter: Gyula Fora
• Created: 07/Feb/16 20:04
• Updated: 03/Apr/17 12:44
• Resolved: 03/Apr/17 12:44

Description

Currently there is a StateBackend interface and an AbstractStateBackend class which are not very closely related to each other. I think this should be cleared up before the 1.0 release a little bit.

The KvState for instance requires an AbstractStateBackend which does not implement the StateBackend. On the other hand the StateDescriptors bind to StateBackends

I think we could get rid of the StateBackend interface and rename the AbstractStateBackend -> StateBackend. We only need to modify the bind method of the descriptors.