Yu Li created FLINK-12693:
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Summary: Store state per key-group in CopyOnWriteStateTable
Key: FLINK-12693
URL: https://issues.apache.org/jira/browse/FLINK-12693
Project: Flink
Issue Type: Sub-task
Components: Runtime / State Backends
Reporter: Yu Li
Assignee: Yu Li
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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