sanghyeok An created KAFKA-20889:
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Summary: Consider rejecting empty group.instance.id values in
Kafka Streams
Key: KAFKA-20889
URL: https://issues.apache.org/jira/browse/KAFKA-20889
Project: Kafka
Issue Type: Bug
Reporter: sanghyeok An
Assignee: sanghyeok An
ConsumerConfig only permits non-empty group.instance.id values, and a regular
KafkaConsumer rejects an empty value with a ConfigException.
Kafka Streams currently appends the stream thread index before consumer
validation. As a result:
group.instance.id="" → "-1", "-2", ...
These derived values pass validation and enable static membership. Multiple
application instances may then generate the same instance IDs.
We should consider validating the base group.instance.id before appending the
thread index and rejecting empty values consistently with ConsumerConfig.
Unit-test coverage should be added if this behavior is changed.
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