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https://issues.apache.org/jira/browse/KAFKA-20889?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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sanghyeok An updated KAFKA-20889:
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Labels: streams (was: needs-kip streams)
> 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
> Priority: Minor
> Labels: streams
>
> 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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