[jira] [Created] (FLINK-1176) Add operator for global reduce/aggregations

[Shang Yuanchun (Jira)]

Gyula Fora created FLINK-1176:
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             Summary: 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
            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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