Github user mbalassi commented on a diff in the pull request:
https://github.com/apache/flink/pull/804#discussion_r31910888
--- Diff:
flink-staging/flink-streaming/flink-streaming-core/src/main/java/org/apache/flink/streaming/api/environment/StreamExecutionEnvironment.java
---
@@ -412,7 +412,7 @@ public void registerType(Class<?> type) {
if (from > to) {
throw new IllegalArgumentException("Start of sequence
must not be greater than the end");
}
- return fromCollection(new NumberSequenceIterator(from, to),
BasicTypeInfo.LONG_TYPE_INFO, "Sequence Source");
+ return addSource(new StatefulSequenceSource(from, to),
"Sequence Source").setParallelism(1);
}
--- End diff --
This is a bit hacky. The problem is that this solution permits the user to
manually set the parallelism to bigger later, which breaks the assumptions
about non-parallel sources.
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