Xiaogang Shi created FLINK-4856:
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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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