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https://issues.apache.org/jira/browse/FLINK-25115?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Martijn Visser closed FLINK-25115.
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Resolution: Not A Problem
The Flink metrics you are looking at only measure traffic happening within the
Flink cluster itself (using Flink's serializers and network stack), and ignore
the communication at the edges of the job graph (using the connectors'
serializers and networking).
In other words, sources never report records coming in, and sinks never report
records going out.
> Why Flink Sink operator metric numRecordsOut and numRecordsOutPerSecond
> always equal 0
> --------------------------------------------------------------------------------------
>
> Key: FLINK-25115
> URL: https://issues.apache.org/jira/browse/FLINK-25115
> Project: Flink
> Issue Type: Bug
> Affects Versions: 1.13.2
> Reporter: hjw
> Priority: Major
> Attachments: image-2021-11-30-23-56-26-222.png
>
>
> I submit a Flink-sql job .I found that the numRecordsOut and
> numRecordsOutPerSecond indicators are always 0.
>
> !image-2021-11-30-23-56-26-222.png!
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