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https://issues.apache.org/jira/browse/KAFKA-15755?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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David Jacot resolved KAFKA-15755.
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Fix Version/s: 3.4.2
3.5.2
3.7.0
3.6.1
Resolution: Fixed
> LeaveGroupResponse v0-v2 should handle no members
> -------------------------------------------------
>
> Key: KAFKA-15755
> URL: https://issues.apache.org/jira/browse/KAFKA-15755
> Project: Kafka
> Issue Type: Bug
> Reporter: Robert Wagner
> Assignee: Robert Wagner
> Priority: Major
> Fix For: 3.4.2, 3.5.2, 3.7.0, 3.6.1
>
>
> When Sarama and Librdkafka consumer clients issue LeaveGroup requests, they
> use an older protocol version < 3 which did not include a `members` field.
> Since our upgrade the kafka broker 3.4.1 we have started seeing these broker
> exceptions:
> {code}
> [2023-10-24 01:17:17,214] ERROR [KafkaApi-28598] Unexpected error handling
> request RequestHeader(apiKey=LEAVE_GROUP, apiVersion=1, clientId=REDACTED,
> correlationId=116775, headerVersion=1) --
> LeaveGroupRequestData(groupId=REDACTED,
> memberId='REDACTED-73967453-93c4-4f3f-bcef-32c1f280350f', members=[]) with
> context RequestContext(header=RequestHeader(apiKey=LEAVE_GROUP, apiVersion=1,
> clientId=REDACTED, correlationId=116775, headerVersion=1),
> connectionId='REDACTED', clientAddress=/REDACTED, principal=REDACTED,
> listenerName=ListenerName(PLAINTEXT), securityProtocol=PLAINTEXT,
> clientInformation=ClientInformation(softwareName=confluent-kafka-python,
> softwareVersion=1.7.0-rdkafka-1.7.0), fromPrivilegedListener=false,
> principalSerde=Optional[REDACTED]) (kafka.server.KafkaApis)
> java.util.concurrent.CompletionException:
> org.apache.kafka.common.errors.UnsupportedVersionException: LeaveGroup
> response version 1 can only contain one member, got 0 members.
> at
> java.base/java.util.concurrent.CompletableFuture.encodeThrowable(CompletableFuture.java:315)
> at
> java.base/java.util.concurrent.CompletableFuture.completeThrowable(CompletableFuture.java:320)
> at
> java.base/java.util.concurrent.CompletableFuture.uniHandle(CompletableFuture.java:936)
> at
> java.base/java.util.concurrent.CompletableFuture.uniHandleStage(CompletableFuture.java:950)
> at
> java.base/java.util.concurrent.CompletableFuture.handle(CompletableFuture.java:2340)
> at kafka.server.KafkaApis.handleLeaveGroupRequest(KafkaApis.scala:1796)
> at kafka.server.KafkaApis.handle(KafkaApis.scala:196)
> at kafka.server.KafkaRequestHandler.run(KafkaRequestHandler.scala:75)
> at java.base/java.lang.Thread.run(Thread.java:833)
> Caused by: org.apache.kafka.common.errors.UnsupportedVersionException:
> LeaveGroup response version 1 can only contain one member, got 0 members.
> {code}
>
> KIP-848 introduced a check in LeaveGroupResponse that the members field must
> have 1 element. In some error cases, it seems like the members field has 0
> elements - which would still be a valid response for v0-v2 messages, but this
> exception was being thrown.
> Instead of throwing an exception in this case, continue with the
> LeaveGroupResponse, since it is not a field included in v0 - v2 responses
> anyway.
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