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https://issues.apache.org/jira/browse/FLINK-21159?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17317537#comment-17317537
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Stephan Ewen commented on FLINK-21159:
--------------------------------------
Fixed in 1.12.3 via
- 3b9b357cbdd81cdab5f36ed524362c18513d82a9
> KafkaSourceEnumerator not sending NoMoreSplitsEvent to unassigned reader
> ------------------------------------------------------------------------
>
> Key: FLINK-21159
> URL: https://issues.apache.org/jira/browse/FLINK-21159
> Project: Flink
> Issue Type: Bug
> Components: Connectors / Kafka
> Reporter: Qingsheng Ren
> Assignee: Qingsheng Ren
> Priority: Major
> Labels: pull-request-available
> Fix For: 1.13.0, 1.12.3
>
>
> Kafka split enumerator only sends {{NoMoreSplitsEvent}} when assigning splits
> to a reader. If a reader is not assigned with any splits, it won't receive
> `NoMoreSplitsEvent`, and the subtask will stay in RUNNING state forever but
> not actually working.
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