dajac commented on code in PR #14120:
URL: https://github.com/apache/kafka/pull/14120#discussion_r1302268054
##########
group-coordinator/src/main/java/org/apache/kafka/coordinator/group/GroupCoordinatorService.java:
##########
@@ -480,9 +482,35 @@ public
CompletableFuture<List<OffsetFetchResponseData.OffsetFetchResponseTopics>
return
FutureUtils.failedFuture(Errors.COORDINATOR_NOT_AVAILABLE.exception());
}
- return FutureUtils.failedFuture(Errors.UNSUPPORTED_VERSION.exception(
- "This API is not implemented yet."
- ));
+ // For backwards compatibility, we support fetch commits for the empty
groupId.
Review Comment:
No. It means that you can actually commit offsets to a group names with an
empty group id. I was not aware of this until I rewrote this code.
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