dongnuo123 commented on code in PR #15721: URL: https://github.com/apache/kafka/pull/15721#discussion_r1568994033
########## group-coordinator/src/main/java/org/apache/kafka/coordinator/group/consumer/ConsumerGroup.java: ########## @@ -998,4 +1094,232 @@ public ConsumerGroupDescribeResponseData.DescribedGroup asDescribedGroup( ); return describedGroup; } + + /** + * Create a new consumer group according to the given classic group. + * + * @param snapshotRegistry The SnapshotRegistry. + * @param metrics The GroupCoordinatorMetricsShard. + * @param classicGroup The converted classic group. + * @param topicsImage The TopicsImage for topic id and topic name conversion. + * @return The created ConsumerGruop. + */ + public static ConsumerGroup fromClassicGroup( + SnapshotRegistry snapshotRegistry, + GroupCoordinatorMetricsShard metrics, + ClassicGroup classicGroup, + TopicsImage topicsImage + ) { + String groupId = classicGroup.groupId(); + ConsumerGroup consumerGroup = new ConsumerGroup(snapshotRegistry, groupId, metrics); + consumerGroup.setGroupEpoch(classicGroup.generationId()); + consumerGroup.setTargetAssignmentEpoch(classicGroup.generationId()); + + classicGroup.allMembers().forEach(classicGroupMember -> { + ConsumerPartitionAssignor.Assignment assignment = ConsumerProtocol.deserializeAssignment( + ByteBuffer.wrap(classicGroupMember.assignment()) + ); + Map<Uuid, Set<Integer>> partitions = topicPartitionMapFromList(assignment.partitions(), topicsImage); + + ConsumerPartitionAssignor.Subscription subscription = ConsumerProtocol.deserializeSubscription( + ByteBuffer.wrap(classicGroupMember.metadata(classicGroup.protocolName().get())) + ); + + // The target assignment and the assigned partitions of each member are set based on the last + // assignment of the classic group. All the members are put in the Stable state. If the classic + // group was in Preparing Rebalance or Completing Rebalance states, the classic members are + // asked to rejoin the group to re-trigger a rebalance or collect their assignments. + ConsumerGroupMember newMember = new ConsumerGroupMember.Builder(classicGroupMember.memberId()) + .setMemberEpoch(classicGroup.generationId()) + .setState(MemberState.STABLE) + .setPreviousMemberEpoch(classicGroup.generationId()) + .setInstanceId(classicGroupMember.groupInstanceId().orElse(null)) + .setRackId(subscription.rackId().orElse(null)) + .setRebalanceTimeoutMs(classicGroupMember.rebalanceTimeoutMs()) + .setClientId(classicGroupMember.clientId()) + .setClientHost(classicGroupMember.clientHost()) + .setSubscribedTopicNames(subscription.topics()) + .setAssignedPartitions(partitions) + .setSupportedClassicProtocols(classicGroupMember.supportedProtocols()) + .build(); + consumerGroup.updateTargetAssignment(newMember.memberId(), new Assignment(partitions)); + consumerGroup.updateMember(newMember); + }); + + return consumerGroup; + } + + /** + * Populate the record list with the records needed to create the given consumer group. + * + * @param records The list to which the new records are added. + */ + public void createConsumerGroupRecords( + List<Record> records + ) { + members().forEach((__, consumerGroupMember) -> + records.add(RecordHelpers.newMemberSubscriptionRecord(groupId(), consumerGroupMember)) + ); + + records.add(RecordHelpers.newGroupEpochRecord(groupId(), groupEpoch())); + + members().forEach((consumerGroupMemberId, consumerGroupMember) -> + records.add(RecordHelpers.newTargetAssignmentRecord( + groupId(), + consumerGroupMemberId, + targetAssignment(consumerGroupMemberId).partitions() + )) + ); + + records.add(RecordHelpers.newTargetAssignmentEpochRecord(groupId(), groupEpoch())); + + members().forEach((__, consumerGroupMember) -> + records.add(RecordHelpers.newCurrentAssignmentRecord(groupId(), consumerGroupMember)) + ); + } + + /** + * @return The map of topic id and partition set converted from the list of TopicPartition. + */ + private static Map<Uuid, Set<Integer>> topicPartitionMapFromList( + List<TopicPartition> partitions, + TopicsImage topicsImage + ) { + Map<Uuid, Set<Integer>> topicPartitionMap = new HashMap<>(); + partitions.forEach(topicPartition -> { + TopicImage topicImage = topicsImage.getTopic(topicPartition.topic()); + if (topicImage != null) { + topicPartitionMap + .computeIfAbsent(topicImage.id(), __ -> new HashSet<>()) + .add(topicPartition.partition()); + } + }); + return topicPartitionMap; + } + + /** + * Create a corresponding ClassicGroup and append the record for the creation for group downgrade. + * The member with leavingMemberId will not be converted to the new ClassicGroup as it's the last + * member using new consumer protocol that left and triggered the downgrade. + * + * @param leavingMemberId The member that will not be converted in the ClassicGroup. + * @param logContext The logContext to create the ClassicGroup. + * @param time The time to create the ClassicGroup. + * @param consumerGroupSessionTimeoutMs The consumerGroupSessionTimeoutMs. + * @param metadataImage The metadataImage. + * @param records The record list. + * @return The created ClassicGroup. + */ + public ClassicGroup toClassicGroup( + String leavingMemberId, + LogContext logContext, + Time time, + int consumerGroupSessionTimeoutMs, + MetadataImage metadataImage, + List<Record> records + ) { + ClassicGroup classicGroup = new ClassicGroup( + logContext, + groupId(), + ClassicGroupState.STABLE, + time, + metrics, + groupEpoch(), + Optional.ofNullable(ConsumerProtocol.PROTOCOL_TYPE), + Optional.empty(), + members().keySet().stream().filter(member -> !member.equals(leavingMemberId)).findAny(), + Optional.of(time.milliseconds()) + ); + + members().forEach((memberId, member) -> { + if (!memberId.equals(leavingMemberId)) { + classicGroup.add( + new ClassicGroupMember( + memberId, + Optional.ofNullable(member.instanceId()), + member.clientId(), + member.clientHost(), + member.rebalanceTimeoutMs(), + consumerGroupSessionTimeoutMs, + ConsumerProtocol.PROTOCOL_TYPE, + member.supportedJoinGroupRequestProtocols(), Review Comment: I'm not sure if I get it. The stored protocols should keep updating whenever the group receives the JoinGroupRequest during the mixed mode. So the protocol here is stored in the member's latest JoinGroupRequest. -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: jira-unsubscr...@kafka.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org