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Posted to issues@flink.apache.org by "Kenneth William Krugler (Jira)" <ji...@apache.org> on 2020/08/13 14:46:00 UTC
[jira] [Commented] (FLINK-18934) Idle stream does not advance
watermark in connected stream
[ https://issues.apache.org/jira/browse/FLINK-18934?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17177070#comment-17177070 ]
Kenneth William Krugler commented on FLINK-18934:
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Hi [~kien_truong] - I would suggest posting this question to the Flink user mailing list, and after reviewing the responses, decide whether this is really a bug.
> 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: Major
>
> 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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