Github user zentol commented on a diff in the pull request:
https://github.com/apache/flink/pull/2939#discussion_r91720508
--- Diff:
flink-streaming-java/src/test/java/org/apache/flink/streaming/runtime/tasks/SourceStreamTaskTest.java
---
@@ -199,11 +200,13 @@ public Serializable snapshotState(long checkpointId,
long checkpointTimestamp) t
Assert.fail("Count is different at start end
end of snapshot.");
}
semaphore.release();
- return sum;
+ return Collections.singletonList((Serializable) sum);
--- End diff --
You don't to cast here, instead use `return
Collections.<Serializable>singletonList(sum);`
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