private boolean isMemberAtMaxCapacity(String memberId) {
            return targetAssignmentSize(memberId) >= maxAssignmentSize(memberId);
        }
@param memberId      The member Id.
@return If the given member is at maximum capacity.
group-coordinator/src/main/java/org/apache/kafka/coordinator/group/assignor/UniformHeterogeneousAssignmentBuilder.java