Github user chenqin commented on a diff in the pull request:
https://github.com/apache/flink/pull/3484#discussion_r104847832
--- Diff:
flink-streaming-java/src/main/java/org/apache/flink/streaming/api/graph/StreamingJobGraphGenerator.java
---
@@ -439,6 +450,7 @@ public static boolean isChainable(StreamEdge edge,
StreamGraph streamGraph) {
headOperator.getChainingStrategy() ==
ChainingStrategy.ALWAYS)
&& (edge.getPartitioner() instanceof
ForwardPartitioner)
&& upStreamVertex.getParallelism() ==
downStreamVertex.getParallelism()
+ && edge.getOutputTag() == null // disable
chaining for side outputs
--- End diff --
I remember you mentioned latest version side output works with chain or no?
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