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https://issues.apache.org/jira/browse/KAFKA-9984?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Matthias J. Sax resolved KAFKA-9984.
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Fix Version/s: 2.6.0
Resolution: Fixed
> Should fail the subscription when pattern is empty
> --------------------------------------------------
>
> Key: KAFKA-9984
> URL: https://issues.apache.org/jira/browse/KAFKA-9984
> Project: Kafka
> Issue Type: Bug
> Components: consumer
> Reporter: Boyang Chen
> Assignee: HaiyuanZhao
> Priority: Major
> Fix For: 2.6.0
>
>
> We have seen a case where the consumer subscribes to an empty string pattern:
> ```
> [Consumer ... ] Subscribed to pattern: ''
> ```
> which doesn't make any sense and usually indicate a configuration error. The
> `consumer.subscribe(pattern)` call should fail with illegal argument for this
> case.
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