presto-main/src/main/java/io/prestosql/execution/resourcegroups/WeightedFairQueue.java/Node/toString
class Node:        @Override
        public String toString()
        {
            return toStringHelper(this)
                    .add("value", value)
                    .add("usage", usage)
                    .add("logicalCreateTime", logicalCreateTime)
                    .toString();
        }