Yu Li created FLINK-12121:
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Summary: 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
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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