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https://issues.apache.org/jira/browse/FLINK-36780?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17901156#comment-17901156
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Arvid Heise commented on FLINK-36780:
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I'm assigning to [~liuml07] as he already provided a PR.
> Kafka source disable partition discovery unexpectedly
> -----------------------------------------------------
>
> Key: FLINK-36780
> URL: https://issues.apache.org/jira/browse/FLINK-36780
> Project: Flink
> Issue Type: Improvement
> Components: Connectors / Kafka
> Affects Versions: kafka-4.0.0, kafka-3.2.0, kafka-3.3.0, kafka-3.4.0
> Reporter: Mingliang Liu
> Assignee: Mingliang Liu
> Priority: Major
> Labels: pull-request-available
>
> Currently Kafka source enables partition discovery. This is set by
> {{partition.discovery.interval.ms}}, aka
> {{KafkaSourceOptions.PARTITION_DISCOVERY_INTERVAL_MS}}. The default value is
> 5 minutes, which is equal to the default value of {{metadata.max.age.ms}} in
> Kafka.
> However, it's disabled by default unexpectedly in the source builder
> ([code|https://github.com/apache/flink-connector-kafka/blob/main/flink-connector-kafka/src/main/java/org/apache/flink/connector/kafka/source/KafkaSourceBuilder.java#L476-L480]).
> The intention I believe was to only disable for bounded source.
> We need a fix that is able to keep the default partition discovery. This
> could cause data loss after Kafka retention if the new partitions are not
> consumed silently.
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