Xiaogang Shi created FLINK-5790:
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Summary: Use list types when ListStateDescriptor extends
StateDescriptor
Key: FLINK-5790
URL: https://issues.apache.org/jira/browse/FLINK-5790
Project: Flink
Issue Type: Improvement
Reporter: Xiaogang Shi
Assignee: Xiaogang Shi
Flink keeps the state serializer in {{StateDescriptor}}, but it's the
serializer of list elements that is put in {{ListStateDescriptor}}. The
implementation is a little confusing. Some backends need to construct the state
serializer with the element serializer by themselves.
We should use an {{ArrayListSerializer}}, which is composed of the serializer
of the element, in the {{ListStateDescriptor}}. It helps the backend to avoid
constructing the state serializer.
If a backend needs customized serialization of the state (e.g.
{{RocksDBStateBackend}}), it still can obtain the element serializer from the
{{ArrayListSerializer}}.
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