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David Jacot resolved KAFKA-15755. --------------------------------- 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. -- This message was sent by Atlassian Jira (v8.20.10#820010)