Xiaogang Shi created FLINK-4856:

             Summary: Add MapState for keyed streams
                 Key: FLINK-4856
                 URL: https://issues.apache.org/jira/browse/FLINK-4856
             Project: Flink
          Issue Type: New Feature
          Components: State Backends, Checkpointing
            Reporter: Xiaogang Shi

Many states in keyed streams are organized as key-value pairs. Currently, these 
states are implemented by storing the entire map into a ValueState or a 
ListState. The implementation however is very costly because all entries have 
to be serialized/deserialized when updating a single entry. To improve the 
efficiency of these states, MapStates are urgently needed. 

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