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https://issues.apache.org/jira/browse/KAFKA-9984?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17106549#comment-17106549
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Guozhang Wang commented on KAFKA-9984:
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Sounds good to me :)
> 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
> Priority: Major
>
> 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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