Github user gyfora commented on a diff in the pull request:
https://github.com/apache/flink/pull/900#discussion_r34357746
--- Diff:
flink-staging/flink-streaming/flink-streaming-core/src/main/java/org/apache/flink/streaming/api/datastream/IterativeDataStream.java
---
@@ -201,14 +204,16 @@ public
ConnectedIterativeDataStream(IterativeDataStream<I> input, TypeInformatio
* @return The feedback stream.
*
*/
+ @SuppressWarnings({ "rawtypes", "unchecked" })
public DataStream<F> closeWith(DataStream<F> feedbackStream) {
- DataStream<F> iterationSink = new
DataStreamSink<F>(input.environment, "Iteration Sink",
- null, null);
+ if (input.closed) {
+ throw new IllegalStateException(
--- End diff --
I think this is a fair restriction, the user can always union.
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