@Override
        public String toString() {
            return "TopicMetadata(topicId=" + topicId +
                ", numPartitions=" + numPartitions +
                ", numMembers=" + numMembers +
                ", minQuota=" + minQuota +
                ", extraPartitions=" + extraPartitions +
                ", nextRange=" + nextRange +
                ')';
        }
Computes the minimum partition quota per member and the extra partitions, if not already computed.
group-coordinator/src/main/java/org/apache/kafka/coordinator/group/assignor/RangeAssignor.java