[jira] [Created] (FLINK-24347) KafkaSource cannot checkpoint if the parallelism is higher than the partition number

["Fabian Paul (Jira)" <ji...@apache.org>]

Fabian Paul created FLINK-24347:
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             Summary: KafkaSource cannot checkpoint if the parallelism is higher than the partition number
                 Key: FLINK-24347
                 URL: https://issues.apache.org/jira/browse/FLINK-24347
             Project: Flink
          Issue Type: Bug
          Components: Connectors / Kafka
    Affects Versions: 1.13.2, 1.14.0
            Reporter: Fabian Paul


The KafkaSourceEnumerator signals all the readers if there are no more splits available and the readers shut down. In case the parallelism is higher than the partitions of the consumed topic there are not enough partitions to distribute and reader subtasks go immediately into FINISHED state.
Currently, it is not possible to checkpoint if parts of the job are finished. (this is lifted once FLIP-147 is by default enabled Flink 1.15+)

We should only signal to the readers to go into finished if the job is in bounded execution mode and keep them idling otherwise.




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