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https://issues.apache.org/jira/browse/FLINK-39514?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18076077#comment-18076077
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Bowen Li commented on FLINK-39514:
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merged to main via 61f81bd
> Dynamic Kafka source readers do not release splits after removal
> ----------------------------------------------------------------
>
> Key: FLINK-39514
> URL: https://issues.apache.org/jira/browse/FLINK-39514
> Project: Flink
> Issue Type: Bug
> Components: Connectors / Kafka
> Affects Versions: 3.0.0
> Reporter: Xin Gao
> Assignee: Xin Gao
> Priority: Critical
> Labels: pull-request-available
>
> DynamicKafkaSourceReader filtered removed cluster/topic splits out of reader
> state and closed sub-readers, but did not call
> {{{}ReaderOutput.releaseOutputForSplit(...){}}}. Flink keeps split-local
> outputs registered for watermark aggregation until they are explicitly
> released, so removed Kafka splits could continue holding back the source
> watermark indefinitely. ([Flink code
> link|https://github.com/apache/flink/blob/master/flink-core/src/main/java/org/apache/flink/api/connector/source/ReaderOutput.java#L103])
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