Boyang Chen created KAFKA-9984:
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Summary: 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, streams
Reporter: Boyang Chen
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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