Github user fhueske commented on a diff in the pull request:
https://github.com/apache/flink/pull/1517#discussion_r60232838
--- Diff:
flink-core/src/main/java/org/apache/flink/api/common/operators/base/ReduceOperatorBase.java
---
@@ -54,6 +54,32 @@
@Internal
public class ReduceOperatorBase<T, FT extends ReduceFunction<T>> extends
SingleInputOperator<T, T, FT> {
+ /**
+ * An enumeration of hints, optionally usable to tell the system
exactly how to execute the combiner phase
+ * of a reduce.
+ * (Note: The final reduce phase (after combining) is currently always
executed by a sort-based strategy.)
+ */
+ public enum CombineHint {
--- End diff --
+1
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