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https://issues.apache.org/jira/browse/FLINK-35419?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Arvid Heise updated FLINK-35419:
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Fix Version/s: kafka-3.3.0
> scan.bounded.latest-offset makes queries never finish if the latest message
> is a EndTxn Kafka marker
> ----------------------------------------------------------------------------------------------------
>
> Key: FLINK-35419
> URL: https://issues.apache.org/jira/browse/FLINK-35419
> Project: Flink
> Issue Type: Bug
> Components: Connectors / Kafka
> Affects Versions: 1.8.0, 1.16.0, 1.17.0, 1.19.0
> Reporter: Fabian Paul
> Priority: Major
> Fix For: kafka-3.3.0
>
>
> When running the kafka connector in bounded mode, the stop condition can be
> defined as the latest offset when the job starts. Unfortunately, Kafka's
> latest offset calculation also includes special marker records, such as
> transaction markers, in the overall count.
>
> When Flink waits for a job to finish, it compares the number of records read
> until the point with the original latest offset [1]. Since the consumer will
> never see the special marker records, the latest offset is never reached, and
> the job gets stuck.
>
> To reproduce the issue, you can write into a Kafka topic and make sure that
> the latest record is a transaction end event. Afterwards you can start a
> Flink job configured with `scan.bounded.latest-offset` pointing to that topic.
>
> [1]https://github.com/confluentinc/flink/blob/59c5446c4aac0d332a21b456f4a3f82576104b80/flink-connectors/confluent-connector-kafka/flink-connector-kafka/src/main/java/org/apache/flink/connector/kafka/source/reader/KafkaPartitionSplitReader.java#L128
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