Github user aljoscha commented on a diff in the pull request:
https://github.com/apache/flink/pull/2020#discussion_r64221544
--- Diff:
flink-streaming-java/src/main/java/org/apache/flink/streaming/api/datastream/DataStreamSource.java
---
@@ -44,6 +44,11 @@ public DataStreamSource(StreamExecutionEnvironment
environment,
}
}
+ public DataStreamSource(SingleOutputStreamOperator<T> operator) {
--- End diff --
Here, we should always set `isParallel` to `true`. It is not quite obvious
but the field is used to disallow changing the parallelism for a
`SourceFunction` that cannot be parallelized. Our new operator can always run
in parallel.
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