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https://issues.apache.org/jira/browse/KAFKA-20799?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18095842#comment-18095842
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majialong commented on KAFKA-20799:
-----------------------------------
Hi [~showuon] , if you're not working on this, may I take it? Thanks.
> Introduce new error for consumer/share group name collision
> -----------------------------------------------------------
>
> Key: KAFKA-20799
> URL: https://issues.apache.org/jira/browse/KAFKA-20799
> Project: Kafka
> Issue Type: Improvement
> Affects Versions: 4.4.0
> Reporter: Luke Chen
> Priority: Major
>
> When shared group and classic consumer group has name collision, the error is
> not clear to users.
> Scenarios:
> *1. Existing classic consumer group: "test_group"*
> 1.1. When creating a new shared group named "test_group", the clients will
> get this exception:
> {code:java}
> > bin/kafka-console-share-consumer.sh --topic quickstart-events
> > --bootstrap-server localhost:9092 --group test_group
> ERROR [ShareConsumer clientId=console-share-consumer, groupId=bbb]
> ShareGroupHeartbeatRequest failed due to unexpected error GROUP_ID_NOT_FOUND:
> Group test_group is not a share group.
> (org.apache.kafka.clients.consumer.internals.ShareHeartbeatRequestManager){code}
> 1.2. When altering the offset for a classic consumer group named
> "test_group", the clients will get this exception:
> {code:java}
> > ./bin/kafka-share-groups.sh --bootstrap-server localhost:9092 --group
> > test_group --reset-offsets --topic quickstart-events --to-offset 0
> > --execute
> org.apache.kafka.common.errors.GroupIdNotFoundException: Group test_group is
> not a share group. Failed altering group offsets for the following
> partitions: [quickstart-events-0]{code}
>
> *2. Existing share group: "test_share_group"*
> 2.1. When creating a new classic consumer group via joinGroup request,
> clients will get:
> {code:java}
> > bin/kafka-console-consumer.sh --topic quickstart-events --from-beginning
> > --bootstrap-server localhost:9092 --group test_share_group
> ERROR [Consumer clientId=console-consumer, groupId=test_share_group]
> JoinGroup failed due to fatal error: The group member's supported protocols
> are incompatible with those of existing members or first group member tried
> to join with empty protocol type or empty protocol list.
> (org.apache.kafka.clients.consumer.internals.ConsumerCoordinator)
> ERROR Error processing message, terminating consumer process:
> (org.apache.kafka.tools.consumer.ConsoleConsumer)
> org.apache.kafka.common.errors.InconsistentGroupProtocolException: The group
> member's supported protocols are incompatible with those of existing members
> or first group member tried to join with empty protocol type or empty
> protocol list.{code}
> 2.2. When altering the offset for a shared group named "test_share_group",
> the clients will get this exception:
> {code:java}
> > bin/kafka-consumer-groups.sh --bootstrap-server localhost:9092 --group
> > test_share_group --reset-offsets --topic quickstart-events --to-offset 0
> > --execute
> org.apache.kafka.common.errors.GroupIdNotFoundException: Failed altering
> group offsets for the following partitions: [quickstart-events-0]{code}
> *Issues:*
> # Inconsistent errors for classic consumer group handling:
> GroupIdNotFoundException VS InconsistentGroupProtocolException
> # Either it's GroupIdNotFoundException or
> InconsistentGroupProtocolException, it is not clear to users that the group
> id creation failure is because the group id is actually taken by another type
> of group, not "group id not found" or "inconsistent group protocol" error.
> Maybe a new "GroupIdInUseException" is better?
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