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https://issues.apache.org/jira/browse/FLINK-12693?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Yu Li reassigned FLINK-12693:
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Assignee: PengFei Li (was: Yu Li)
> 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: PengFei Li
> Priority: Major
>
> 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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