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

["Dawid Wysakowicz (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/FLINK-18934?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Dawid Wysakowicz closed FLINK-18934.
------------------------------------
    Release Note: We added {{Input#processStreamStatus}} method in order to take the {{StreamStatus}} into account when combining watermarks in two/multi input operators.
      Resolution: Fixed

> 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, 1.13.0
>            Reporter: Truong Duc Kien
>            Assignee: Dawid Wysakowicz
>            Priority: Critical
>              Labels: pull-request-available, stale-assigned
>             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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