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https://issues.apache.org/jira/browse/FLINK-2283?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14604303#comment-14604303
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Aljoscha Krettek commented on FLINK-2283:
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I think the these grouped aggregations could also be implemented as windowed
operations where the window gets never evicted. This is really a special case
where the trigger is set to trigger after every element. What do you think?
> Make grouped reduce/fold/aggregations stateful using Partitioned state
> ----------------------------------------------------------------------
>
> Key: FLINK-2283
> URL: https://issues.apache.org/jira/browse/FLINK-2283
> Project: Flink
> Issue Type: Improvement
> Components: Streaming
> Affects Versions: 0.10
> Reporter: Gyula Fora
> Priority: Minor
>
> Currently the inner state of the grouped aggregations are not persisted as an
> operator state.
> These operators should be reimplemented to use the newly introduced
> partitioned state abstractions which will make them fault tolerant and
> scalable for the future.
> A suggested implementation would be to use a stateful mapper to implement the
> desired behaviour.
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