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  1. Flink
  2. FLINK-12692 Support disk spilling in HeapKeyedStateBackend
  3. FLINK-12693

Store state per key-group in CopyOnWriteStateTable

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      Since we propose to use KeyGroup as the unit of spilling/loading, the first step is to store state per key-groups. Currently NestedMapsStateTable natively supports this, so we only need to refine CopyOnWriteStateTable

      The main efforts required here is to extract the customized hash-map out of CopyOnWriteStateTable then use such a hash-map as the state holder for each KeyGroup. Whereafter we could extract some common logic out into StateTable.

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              • Assignee:
                banmoy PengFei Li
                Reporter:
                liyu Yu Li
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