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https://issues.apache.org/jira/browse/FLINK-1176?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14320664#comment-14320664
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Gyula Fora commented on FLINK-1176:
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This feature amongst several others is introduced here:
https://github.com/apache/flink/pull/395
> Add operator for global reduce/aggregations
> -------------------------------------------
>
> Key: FLINK-1176
> URL: https://issues.apache.org/jira/browse/FLINK-1176
> Project: Flink
> Issue Type: Improvement
> Components: Streaming
> Reporter: Gyula Fora
> Assignee: Gyula Fora
> Priority: Minor
>
> Currently streaming reduce operators (like .reduce or .window(..).reduce,
> sum, etc.) only allow local reduces/aggregations. While one can achieve
> global aggregation by setting the parallelism of these operators to 1 it can
> cause a serious bottleneck in the program.
> For window/batch reduces and aggregations a global reducer can be added, with
> parallelism 1, to further reduce partial results. This global reduce option
> could be introduced as an optional boolean parameter for the intended
> operators.
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