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https://issues.apache.org/jira/browse/FLINK-18934?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17319371#comment-17319371
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Konstantin Knauf commented on FLINK-18934:
------------------------------------------

As this is clearly not a Blocker (open for > 6 months), I've deprioritized it 
to Major for now (see also 
https://cwiki.apache.org/confluence/display/FLINK/Flink+Jira+Process).

> 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, Runtime / Task
>    Affects Versions: 1.11.0, 1.12.0
>            Reporter: Truong Duc Kien
>            Priority: Major
>             Fix For: 1.14.0
>
>
> 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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