[jira] [Closed] (FLINK-5790) Use list types when ListStateDescriptor extends StateDescriptor

["Xiaogang Shi (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/FLINK-5790?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Xiaogang Shi closed FLINK-5790.
-------------------------------
    Resolution: Fixed

Fixed via d47446cafffe0d34d89488f6eb860aa139ceb3f1

> 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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