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https://issues.apache.org/jira/browse/FLINK-2261?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Gyula Fora closed FLINK-2261.
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Resolution: Fixed
> Remove reduce/aggregation from DataStream
> -----------------------------------------
>
> Key: FLINK-2261
> URL: https://issues.apache.org/jira/browse/FLINK-2261
> Project: Flink
> Issue Type: Improvement
> Components: Java API, Scala API, Streaming
> Affects Versions: 0.10
> Reporter: Gyula Fora
> Assignee: Gyula Fora
>
> Currently we have reduce and aggregation methods for non-grouped DataStreams
> as well, which will produce local aggregates depending on the parallelism of
> the operator.
> This behaviour is neither intuitive nor useful as it only produces sensible
> results if the user specifically sets the parallelism to 1 which should not
> be encouraged.
> I would like to remove these methods from the DataStream api and only keep it
> for GroupedDataStreams and WindowedDataStream where the aggregation is either
> executed per-key or per-window.
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