From 0219244afb4ce5590c8ffa1d3c36813fd4c82c54 Mon Sep 17 00:00:00 2001
From: Henning Baldersheim <balder@yahoo-inc.com>
Date: Mon, 27 Sep 2021 23:44:24 +0200
Subject: Precompute host resources to avoid redoing it on every compare during
 sort.

---
 .../provision/provisioning/HostCapacity.java       | 47 ++++++++++++++--------
 1 file changed, 30 insertions(+), 17 deletions(-)

(limited to 'node-repository')

diff --git a/node-repository/src/main/java/com/yahoo/vespa/hosted/provision/provisioning/HostCapacity.java b/node-repository/src/main/java/com/yahoo/vespa/hosted/provision/provisioning/HostCapacity.java
index 59c942f3298..ce9193e9669 100644
--- a/node-repository/src/main/java/com/yahoo/vespa/hosted/provision/provisioning/HostCapacity.java
+++ b/node-repository/src/main/java/com/yahoo/vespa/hosted/provision/provisioning/HostCapacity.java
@@ -6,6 +6,8 @@ import com.yahoo.config.provision.NodeType;
 import com.yahoo.vespa.hosted.provision.Node;
 import com.yahoo.vespa.hosted.provision.NodeList;
 
+import java.util.ArrayList;
+import java.util.HashSet;
 import java.util.List;
 import java.util.Objects;
 import java.util.Set;
@@ -42,14 +44,33 @@ public class HostCapacity {
      * @param count the max number of spare hosts to return
      */
     public Set<Node> findSpareHosts(List<Node> candidates, int count) {
-        return candidates.stream()
-                         .filter(node -> node.type().canRun(NodeType.tenant))
-                         .filter(host -> host.state() == Node.State.active)
-                         .filter(host -> host.reservedTo().isEmpty())
-                         .filter(host -> freeIps(host) > 0)
-                         .sorted(this::compareWithoutInactive)
-                         .limit(count)
-                         .collect(Collectors.toSet());
+        ArrayList<NodeWithHostResources> nodesWithIp = new ArrayList<>(candidates.size());
+        for (Node node : candidates) {
+            if (node.type().canRun(NodeType.tenant) && (node.state() == Node.State.active) && node.reservedTo().isEmpty()) {
+                int numFreeIps = freeIps(node);
+                if (numFreeIps > 0) {
+                    nodesWithIp.add(new NodeWithHostResources(node, availableCapacityOf(node, true, false), numFreeIps));
+                }
+            }
+        }
+        return nodesWithIp.stream().sorted().limit(count).map(n -> n.node).collect(Collectors.toSet());
+    }
+    private static class NodeWithHostResources implements Comparable<NodeWithHostResources> {
+        private final Node node;
+        private final NodeResources hostResources;
+        private final int numFreeIps;
+        NodeWithHostResources(Node node, NodeResources hostResources, int freeIps) {
+            this.node = node;
+            this.hostResources = hostResources;
+            this.numFreeIps = freeIps;
+        }
+
+        @Override
+        public int compareTo(HostCapacity.NodeWithHostResources b) {
+            int result = compare(b.hostResources, hostResources);
+            if (result != 0) return result;
+            return b.numFreeIps - numFreeIps;
+        }
     }
 
     public Set<Node> findSpareHostsInDynamicallyProvisionedZones(List<Node> candidates) {
@@ -61,15 +82,7 @@ public class HostCapacity {
                 .collect(Collectors.toSet());
     }
 
-    private int compareWithoutInactive(Node a, Node b) {
-        int result = compare(availableCapacityOf(b, true, false), availableCapacityOf(a, true, false));
-        if (result != 0) return result;
-
-        // If resources are equal we want to assign to the one with the most IP addresses free
-        return freeIps(b) - freeIps(a);
-    }
-
-    private int compare(NodeResources a, NodeResources b) {
+    private static int compare(NodeResources a, NodeResources b) {
         return NodeResourceComparator.defaultOrder().compare(a, b);
     }
 
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