[jira] [Commented] (FLINK-2283) Make grouped reduce/fold/aggregations stateful using Partitioned state

["Aljoscha Krettek (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/FLINK-2283?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14604303#comment-14604303 ] 

Aljoscha Krettek commented on FLINK-2283:
-----------------------------------------

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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