@Override
            public String toString() {
                return "MemberAssignmentData(" +
                    "memberId='" + memberId + '\'' +
                    ", currentAssignmentSize=" + currentAssignmentSize +
                    ", maxAssignmentSize=" + maxAssignmentSize +
                    ')';
            }
Constructs a MemberAssignmentData with the given member Id.

@param memberId The Id of the member.
group-coordinator/src/main/java/org/apache/kafka/coordinator/group/assignor/UniformHeterogeneousAssignmentBuilder.java