return earliestStartTimeOnNode.UnixNano()
		}

		// Each scoreFunc scores the nodes according to specific rules and keeps the name of the node
		// with the highest score. If and only if the scoreFunc has more than one node with the highest
		// score, we will execute the other scoreFunc in order of precedence.
		scoreFuncs = []func(string) int64{
			// A node with a minimum number of PDB is preferable.