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https://issues.apache.org/jira/browse/FLINK-18934?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17191470#comment-17191470
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Zhu Zhu commented on FLINK-18934:
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I think this ticket still needs some time to figure out a proper solution, so
moving it to 1.11.3.
> 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
> Priority: Critical
> Fix For: 1.12.0, 1.11.2
>
>
> 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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