Github user fhueske commented on a diff in the pull request:
https://github.com/apache/flink/pull/1822#discussion_r56904841
--- Diff:
flink-optimizer/src/main/java/org/apache/flink/optimizer/operators/ReduceProperties.java
---
@@ -61,6 +65,9 @@ public SingleInputPlanNode instantiate(Channel in,
SingleInputNode node) {
if (in.getShipStrategy() == ShipStrategyType.FORWARD ||
(node.getBroadcastConnections() != null &&
!node.getBroadcastConnections().isEmpty()))
{
+ if(in.getSource().getOptimizerNode() instanceof
PartitionNode) {
+ LOG.warn("Consider adding an explicit
CombinerFunction with groupCombine in front of the partition operator");
--- End diff --
Can you extend the error message as follows?
> Cannot automatically inject combiner for ReduceFunction. Please add an
explicit combiner with combineGroup() in front of the partition operator.
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