dongnuo123 commented on code in PR #15798:
URL: https://github.com/apache/kafka/pull/15798#discussion_r1580183181
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group-coordinator/src/main/java/org/apache/kafka/coordinator/group/GroupMetadataManager.java:
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@@ -1336,6 +1422,233 @@ private
CoordinatorResult<ConsumerGroupHeartbeatResponseData, Record> consumerGr
return new CoordinatorResult<>(records, response);
}
+ /**
+ * Handle a JoinGroupRequest to a ConsumerGroup.
+ *
+ * @param group The group to join.
+ * @param context The request context.
+ * @param request The actual JoinGroup request.
+ * @param responseFuture The join group response future.
+ *
+ * @return The result that contains records to append if the join group
phase completes.
+ */
+ private CoordinatorResult<Void, Record> consumerGroupJoin(
+ ConsumerGroup group,
+ RequestContext context,
+ JoinGroupRequestData request,
+ CompletableFuture<JoinGroupResponseData> responseFuture
+ ) throws ApiException {
+ final long currentTimeMs = time.milliseconds();
+ final List<Record> records = new ArrayList<>();
+ final String groupId = request.groupId();
+ String memberId = request.memberId();
+ final String instanceId = request.groupInstanceId();
+ final JoinGroupRequestProtocolCollection protocols =
request.protocols();
+
+ final boolean isUnknownMember = memberId.equals(UNKNOWN_MEMBER_ID);
+ final ConsumerPartitionAssignor.Subscription subscription =
deserializeSubscription(protocols);
+ List<ConsumerGroupHeartbeatRequestData.TopicPartitions>
ownedTopicPartitions = null;
+
+ if (!validateClassicGroupSessionTimeout(memberId,
request.sessionTimeoutMs(), responseFuture)) {
+ return EMPTY_RESULT;
+ }
+ throwIfConsumerGroupIsFull(group, memberId);
+ // TODO: need to throw an exception if group is dead?
+
+ // Get or create the member.
+ if (isUnknownMember) memberId = Uuid.randomUuid().toString();
+ ConsumerGroupMember member;
+ ConsumerGroupMember.Builder updatedMemberBuilder;
+ boolean staticMemberReplaced = false;
+ boolean newMemberCreated = false;
+ if (instanceId == null) {
+ if (isUnknownMember &&
JoinGroupRequest.requiresKnownMemberId(context.apiVersion())) {
+ // If member id required, send back a response to call for
another join group request with allocated member id.
+ log.info("Dynamic member with unknown member id joins group
{}. " +
+ "Created a new member id {} and requesting the member
to rejoin with this id.",
+ group.groupId(), memberId);
+
+ responseFuture.complete(new JoinGroupResponseData()
+ .setMemberId(memberId)
+ .setErrorCode(Errors.MEMBER_ID_REQUIRED.code())
+ );
+ return EMPTY_RESULT;
+ } else {
+ // A dynamic member (re-)joins.
+ throwIfClassicProtocolIsNotSupported(group, memberId,
request.protocolType(), protocols);
+ newMemberCreated = !group.hasMember(memberId);
+
+ member = group.getOrMaybeCreateMember(memberId, true);
+ if (!newMemberCreated) ownedTopicPartitions =
validateGenerationIdAndGetOwnedPartition(member, subscription);
+ log.info("[GroupId {}] Member {} joins the consumer group.",
groupId, memberId);
+ updatedMemberBuilder = new ConsumerGroupMember.Builder(member);
+ }
+ } else {
+ throwIfClassicProtocolIsNotSupported(group, memberId,
request.protocolType(), protocols);
+ member = group.staticMember(instanceId);
+ // A new static member joins or the existing static member rejoins.
+ if (isUnknownMember) {
+ newMemberCreated = true;
+ if (member == null) {
+ // New static member.
+ member = group.getOrMaybeCreateMember(memberId, true);
+ updatedMemberBuilder = new
ConsumerGroupMember.Builder(member);
+ log.info("[GroupId {}] Static member {} with instance id
{} joins the consumer group.", groupId, memberId, instanceId);
+ } else {
+ // Replace the current static member.
Review Comment:
If a static member joins without a member id, we replace any existing member
with the same instance id;
if the static member joins with a member id, then we treat it as a normal
rejoin if the static member exists and the member id matches, and throw an
exception otherwise.
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