David Jacot created KAFKA-19246:
-----------------------------------

             Summary: OffsetFetch API does not return group level errors 
correctly with version 1
                 Key: KAFKA-19246
                 URL: https://issues.apache.org/jira/browse/KAFKA-19246
             Project: Kafka
          Issue Type: Bug
    Affects Versions: 4.0.0, 3.9.0, 3.8.0, 3.7.0, 3.6.0, 3.5.0
            Reporter: David Jacot
            Assignee: David Jacot


The OffsetFetch API with version 1 does not correctly return group level errors 
such as NOT_COORDINATOR. The following test case demonstrate the issue.
{code:java}
@ClusterTest
def testGroupErrors(): Unit = {
  createTopic(
    topic = "foo",
    numPartitions = 3
  )

  assertEquals(
    new OffsetFetchResponseData.OffsetFetchResponseGroup()
      .setGroupId("unknown")
      .setErrorCode(Errors.NOT_COORDINATOR.code),
    fetchOffsets(
      groupId = "unknown",
      memberId = "",
      memberEpoch = 0,
      partitions = List(
        new TopicPartition("foo", 0),
        new TopicPartition("foo", 1)
      ),
      requireStable = true,
      version = 1.toShort
    )
  )
} {code}
Here is the output:
{noformat}
Expected :OffsetFetchResponseGroup(groupId='unknown', topics=[], errorCode=16)
Actual   :OffsetFetchResponseGroup(groupId='unknown', topics=[], 
errorCode=0){noformat}
The issue is here: 
https://github.com/apache/kafka/pull/19642#discussion_r2074839488.



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