Jason Gustafson created KAFKA-14201: ---------------------------------------
Summary: Consumer should not send group instance ID if committing with empty member ID Key: KAFKA-14201 URL: https://issues.apache.org/jira/browse/KAFKA-14201 Project: Kafka Issue Type: Bug Reporter: Jason Gustafson The consumer group instance ID is used to support a notion of "static" consumer groups. The idea is to be able to identify the same group instance across restarts so that a rebalance is not needed. However, if the user sets `group.instance.id` in the consumer configuration, but uses "simple" assignment with `assign()`, then the instance ID nevertheless is sent in the OffsetCommit request to the coordinator. This may result in a surprising UNKNOWN_MEMBER_ID error. The consumer should probably be smart enough to only send the instance ID when committing as part of a consumer group. -- This message was sent by Atlassian Jira (v8.20.10#820010)