Github user rmetzger commented on a diff in the pull request:
https://github.com/apache/flink/pull/1343#discussion_r44404877
--- Diff:
flink-streaming-java/src/main/java/org/apache/flink/streaming/api/datastream/WindowedStream.java
---
@@ -167,15 +166,11 @@ public WindowedStream(KeyedStream<T, K> input,
evictor).enableSetProcessingTime(setProcessingTime);
} else {
- // we need to copy because we need our own instance of
the pre aggregator
- @SuppressWarnings("unchecked")
- ReduceFunction<T> functionCopy = (ReduceFunction<T>)
SerializationUtils.clone(function);
--- End diff --
The user function will be serialized for shipping to the TaskManagers.
So at the Taskmanager's, will create new instances of the user function
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