vamossagar12 commented on code in PR #14432:
URL: https://github.com/apache/kafka/pull/14432#discussion_r1383618637
##########
group-coordinator/src/main/java/org/apache/kafka/coordinator/group/GroupMetadataManager.java:
##########
@@ -983,27 +1085,81 @@ private
CoordinatorResult<ConsumerGroupHeartbeatResponseData, Record> consumerGr
return new CoordinatorResult<>(records, response);
}
+ private void replaceStaticMemberInConsumerGroup(
+ List<Record> records,
+ ConsumerGroup group,
+ ConsumerGroupMember existingStaticMember
+ ) {
+ // Write tombstones for the departed static member.
+ removeMember(records, group.groupId(),
existingStaticMember.memberId());
+ // Cancel all the timers of the departed static member.
+ cancelTimers(group.groupId(), existingStaticMember.memberId());
+ }
+
+ private boolean staticMemberReplaced(int memberEpoch, ConsumerGroupMember
existingStaticMember) {
+ return memberEpoch == 0 && existingStaticMember != null &&
existingStaticMember.memberEpoch() == LEAVE_GROUP_STATIC_MEMBER_EPOCH;
+ }
+
/**
* Handles leave request from a consumer group member.
* @param groupId The group id from the request.
* @param memberId The member id from the request.
+ * @param memberEpoch The member epoch from the request.
*
* @return A Result containing the ConsumerGroupHeartbeat response and
* a list of records to update the state machine.
*/
private CoordinatorResult<ConsumerGroupHeartbeatResponseData, Record>
consumerGroupLeave(
String groupId,
- String memberId
+ String instanceId,
+ String memberId,
+ int memberEpoch
) throws ApiException {
ConsumerGroup group = getOrMaybeCreateConsumerGroup(groupId, false);
- ConsumerGroupMember member = group.getOrMaybeCreateMember(memberId,
false);
+ ConsumerGroupMember member = memberEpoch ==
LEAVE_GROUP_STATIC_MEMBER_EPOCH ?
+ group.staticMember(instanceId) :
+ group.getOrMaybeCreateMember(memberId, false);
- log.info("[GroupId " + groupId + "] Member " + memberId + " left the
consumer group.");
-
- List<Record> records = consumerGroupFenceMember(group, member);
+ List<Record> records = new ArrayList<>();
+ if (memberEpoch == LEAVE_GROUP_STATIC_MEMBER_EPOCH) {
+ throwIfStaticMemberValidationFails(groupId, instanceId, member,
memberEpoch, memberId);
+ log.info("[GroupId {}] Member {} with instance id {} is a static
member and will not be fenced from the group",
+ group.groupId(), member.memberId(), member.instanceId());
+ records.addAll(consumerGroupStaticMemberGroupLeave(group, member,
memberId));
+ } else {
+ log.info("[GroupId {}] Member {} left the consumer group.",
groupId, memberId);
+ records.addAll(consumerGroupFenceMember(group, member));
+ }
return new CoordinatorResult<>(records, new
ConsumerGroupHeartbeatResponseData()
.setMemberId(memberId)
- .setMemberEpoch(LEAVE_GROUP_MEMBER_EPOCH));
+ .setMemberEpoch(memberEpoch));
+ }
+
+ /**
+ * Handles the case when a static member decides to leave the group.
+ * The member is not actually fenced from the group, and instead it's
+ * member epoch is updated to -2 to reflect that a member using the given
+ * instance id decided to leave the group and would be back within session
+ * timeout.
+ *
+ * @param group The group.
+ * @param existingStaticMember The member.
Review Comment:
done.
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