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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