[jira] [Updated] (FLINK-12693) Store state per key-group in CopyOnWriteStateTable

["ASF GitHub Bot (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/FLINK-12693?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

ASF GitHub Bot updated FLINK-12693:
-----------------------------------
    Labels: pull-request-available  (was: )

> 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
>              Labels: pull-request-available
>
> 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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