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https://issues.apache.org/jira/browse/FLINK-20777?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17256381#comment-17256381
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Jark Wu commented on FLINK-20777:
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I'm also fine with enabled by default for unbounded mode, and disable for
bounded mode. I think periodically check for 30s interval in a single task
doesn't affect the performance too much.
> 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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