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https://issues.apache.org/jira/browse/FLINK-4856?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15875675#comment-15875675
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ASF GitHub Bot commented on FLINK-4856:
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Github user StefanRRichter commented on the issue:
https://github.com/apache/flink/pull/3336
I have one more point that I forgot in my initial review. It would be great
if you could also provide a paragraph in the Flink documentation about the
MapState. This would improve the accessibility and visibility of this nice
feature a lot for all users.
> Add MapState for keyed streams
> ------------------------------
>
> Key: FLINK-4856
> URL: https://issues.apache.org/jira/browse/FLINK-4856
> Project: Flink
> Issue Type: New Feature
> Components: DataStream API, State Backends, Checkpointing
> Reporter: Xiaogang Shi
> Assignee: Xiaogang Shi
>
> Many states in keyed streams are organized as key-value pairs. Currently,
> these states are implemented by storing the entire map into a ValueState or a
> ListState. The implementation however is very costly because all entries have
> to be serialized/deserialized when updating a single entry. To improve the
> efficiency of these states, MapStates are urgently needed.
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