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https://issues.apache.org/jira/browse/FLINK-20777?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17255847#comment-17255847
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jiawen xiao commented on FLINK-20777:
-------------------------------------

sorry [~renqs],i think this is not a problem. your can read code in 
{{KafkaSourceBuilder}} .

The reason you will find "If the source is bounded, do not run periodic 
partition discovery."

so it's a check for bounded streaming which can prevent users from enabling 
dynamic partition discovery in the case of bounded sources.

> Default value of property "partition.discovery.interval.ms" is not as 
> documented in new Kafka Source
> ----------------------------------------------------------------------------------------------------
>
>                 Key: FLINK-20777
>                 URL: https://issues.apache.org/jira/browse/FLINK-20777
>             Project: Flink
>          Issue Type: Bug
>          Components: Connectors / Kafka
>            Reporter: Qingsheng Ren
>            Priority: Major
>             Fix For: 1.12.1
>
>
> The default value of property "partition.discovery.interval.ms" is documented 
> as 30 seconds in {{KafkaSourceOptions}}, but it will be set as -1 in 
> {{KafkaSourceBuilder}} if user doesn't pass in this property explicitly. 



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