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https://issues.apache.org/jira/browse/FLINK-12121?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16812243#comment-16812243
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Yu Li commented on FLINK-12121:
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Mark as a blocker of FLINK-12066
> Use composition instead of inheritance for the InternalKeyContext logic in
> backend
> ----------------------------------------------------------------------------------
>
> Key: FLINK-12121
> URL: https://issues.apache.org/jira/browse/FLINK-12121
> Project: Flink
> Issue Type: Improvement
> Components: Runtime / State Backends
> Reporter: Yu Li
> Assignee: Yu Li
> Priority: Major
>
> Commonly it's
> [recommended|https://stackoverflow.com/questions/2399544/difference-between-inheritance-and-composition]
> to favor composition over inheritance in java design, but currently in keyed
> backend we're using inheritance for the {{InternalKeyContext}} logic, and
> here we propose to change to the composition way.
> Another advantage of changing to the composition way is that we could remove
> the requirement of a heap backend instance when constructing
> {{HeapRestoreOperation}}, and further making sure all fields are final when
> constructing the {{HeapKeyedStateBackend}}
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