private int targetAssignmentSize(String memberId) {
            MemberAssignmentData memberData = this.membersWithAssignmentSizes.get(memberId);
            if (memberData == null) {
                LOG.warn("Member Id {} not found", memberId);
                return 0;
            }
            return memberData.currentAssignmentSize;
        }
@param memberId       The member Id.
@return The current assignment size for the given member.
group-coordinator/src/main/java/org/apache/kafka/coordinator/group/assignor/UniformHeterogeneousAssignmentBuilder.java