[jira] [Created] (FLINK-18934) Idle stream does not advance watermark in connected stream

[Shang Yuanchun (Jira)]

Truong Duc Kien created FLINK-18934:
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             Summary: Idle stream does not advance watermark in connected stream
                 Key: FLINK-18934
                 URL: https://issues.apache.org/jira/browse/FLINK-18934
             Project: Flink
          Issue Type: Bug
          Components: API / DataStream
    Affects Versions: 1.11.1
            Reporter: Truong Duc Kien


Per Flink documents, when a stream is idle, it will allow watermarks of downstream operator to advance. However, when I connect an active data stream with an idle data stream, the output watermark of the CoProcessOperator does not increase.

Here's a small test that reproduces the problem.

https://github.com/kien-truong/flink-idleness-testing



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