Github user lw-lin commented on the issue: https://github.com/apache/flink/pull/2557 Glad to see this issue got fixed along with https://github.com/apache/flink/pull/2512 -- the fix is [this line in StreamTask](https://github.com/apache/flink/blob/master/flink-streaming-java/src/main/java/org/apache/flink/streaming/runtime/tasks/StreamTask.java#L577). So @tedyu would you mind closing FLINK-3734? :-D
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