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// Copyright 2017 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.vespa.hosted.provision.provisioning;
import com.yahoo.config.provision.Capacity;
import com.yahoo.config.provision.ClusterSpec;
import com.yahoo.config.provision.Environment;
import com.yahoo.config.provision.NodeResources;
import com.yahoo.config.provision.RegionName;
import com.yahoo.config.provision.SystemName;
import com.yahoo.config.provision.Zone;
import com.yahoo.config.provision.NodeFlavors;
import java.util.Arrays;
import java.util.Optional;
/**
* Defines the policies for assigning cluster capacity in various environments
*
* @author bratseth
*/
public class CapacityPolicies {
private final Zone zone;
private final NodeFlavors flavors;
public CapacityPolicies(Zone zone, NodeFlavors flavors) {
this.zone = zone;
this.flavors = flavors;
}
public int decideSize(Capacity requestedCapacity, ClusterSpec.Type clusterType) {
int requestedNodes = ensureRedundancy(requestedCapacity.nodeCount(), clusterType, requestedCapacity.canFail());
if (requestedCapacity.isRequired()) return requestedNodes;
switch(zone.environment()) {
case dev : case test : return 1;
case perf : return Math.min(requestedCapacity.nodeCount(), 3);
case staging: return requestedNodes <= 1 ? requestedNodes : Math.max(2, requestedNodes / 10);
case prod : return requestedNodes;
default : throw new IllegalArgumentException("Unsupported environment " + zone.environment());
}
}
public NodeResources decideNodeResources(Optional<NodeResources> requestedResources, ClusterSpec cluster) {
NodeResources resources = specifiedOrDefaultNodeResources(requestedResources, cluster);
if (resources.allocateByLegacyName()) return resources; // Modification not possible
// Allow slow disks in zones which are not performance sensitive
if (zone.system() == SystemName.cd || zone.environment() == Environment.dev || zone.environment() == Environment.test)
resources = resources.withDiskSpeed(NodeResources.DiskSpeed.any);
// Dev does not cap the cpu of containers since usage is spotty: Allocate just a small amount exclusively
if (zone.environment() == Environment.dev)
resources = resources.withVcpu(0.1);
return resources;
}
private NodeResources specifiedOrDefaultNodeResources(Optional<NodeResources> requestedResources, ClusterSpec cluster) {
if (requestedResources.isPresent() && ! requestedResources.get().allocateByLegacyName())
return requestedResources.get();
if (requestedResources.isEmpty())
return defaultNodeResources(cluster.type());
// Flavor is specified and is allocateByLegacyName: Handle legacy flavor specs
if (zone.system() == SystemName.cd)
return flavors.exists(requestedResources.get().legacyName().get()) ? requestedResources.get()
: defaultNodeResources(cluster.type());
else {
switch (zone.environment()) {
case dev: case test: case staging: return defaultNodeResources(cluster.type());
default:
flavors.getFlavorOrThrow(requestedResources.get().legacyName().get()); // verify existence
// Return this spec containing the legacy flavor name, not the flavor's capacity object
// which describes the flavors capacity, as the point of legacy allocation is to match
// by name, not by resources
return requestedResources.get();
}
}
}
private NodeResources defaultNodeResources(ClusterSpec.Type clusterType) {
if (clusterType == ClusterSpec.Type.admin)
return new NodeResources(0.5, 3, 50);
if (zone.system() == SystemName.cd && zone.environment().isTest())
new NodeResources(4, 4, 50);
return new NodeResources(2, 8, 50);
}
/**
* Whether or not the nodes requested can share physical host with other applications.
* A security feature which only makes sense for prod.
*/
public boolean decideExclusivity(boolean requestedExclusivity) {
return requestedExclusivity && zone.environment() == Environment.prod;
}
/**
* Throw if the node count is 1 for container and content clusters and we're in a production zone
*
* @return the argument node count
* @throws IllegalArgumentException if only one node is requested and we can fail
*/
private int ensureRedundancy(int nodeCount, ClusterSpec.Type clusterType, boolean canFail) {
if (canFail &&
nodeCount == 1 &&
Arrays.asList(ClusterSpec.Type.container, ClusterSpec.Type.content).contains(clusterType) &&
zone.environment().isProduction())
throw new IllegalArgumentException("Deployments to prod require at least 2 nodes per cluster for redundancy");
return nodeCount;
}
}
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