[jira] [Created] (FLINK-3798) Clean up RocksDB state backend access modifiers

["Gyula Fora (JIRA)" <ji...@apache.org>]

Gyula Fora created FLINK-3798:
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             Summary: Clean up RocksDB state backend access modifiers
                 Key: FLINK-3798
                 URL: https://issues.apache.org/jira/browse/FLINK-3798
             Project: Flink
          Issue Type: Improvement
          Components: Streaming Connectors
            Reporter: Gyula Fora
            Priority: Minor


The RocksDB state backend uses a lot package private methods and fields which makes it very hard to subclass the different parts for added functionality. I think these should be protected instead. 

Also the AbstractRocksDBState declares some methods final when there are use-cases when a subclass migh want to call them.

Just to give you an example I am creating a version of the value state which would keep a small cache on heap. For this it would be enough to subclass the RockDBStateBackend and RocksDBVAlue state classes if the above mentioned changes were made. Now I have to use reflection to access package private fields and actually copy classes due to final methods.



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