Jason Gustafson created KAFKA-14201:
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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.
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