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Posted to issues@flink.apache.org by "Truong Duc Kien (Jira)" <ji...@apache.org> on 2020/08/13 07:31:00 UTC
[jira] [Created] (FLINK-18934) Idle stream does not advance
watermark in connected stream
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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