How is state stored in rocksdb?

[kant kodali]

Hi All,

I am wondering how Flink serializes and deserializes state from rockdb?
What is the format used?

For example, say I am doing some stateful streaming and say an object for
my class below represents a state. how does Flink serializes and
deserializes the object of MyClass below? is it just Java or Kryo
serialization? if so, are they queryable?

public class MyClass {
    private Map<Integer, String> map1 = new HashMap<>();
    private Map<Integer, String> map2 = new HashMap<>();
}

Thanks!