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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.Zone;
import java.util.Arrays;
import java.util.Locale;
import java.util.Optional;
/**
* Defines the policies for assigning cluster capacity in various environments
*
* @author bratseth
*/
public class CapacityPolicies {
private final Zone zone;
/* Deployments must match 1-to-1 the advertised resources of a physical host */
private final boolean isUsingAdvertisedResources;
public CapacityPolicies(Zone zone) {
this.zone = zone;
this.isUsingAdvertisedResources = zone.region().value().contains("aws-");
}
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) {
if (requestedResources.isPresent()) assertMinimumResources(requestedResources.get(), cluster);
NodeResources resources = requestedResources.orElse(defaultNodeResources(cluster.type()));
// Allow slow storage in zones which are not performance sensitive
if (zone.system().isCd() || zone.environment() == Environment.dev || zone.environment() == Environment.test)
resources = resources.with(NodeResources.DiskSpeed.any).with(NodeResources.StorageType.any);
// Dev does not cap the cpu of containers since usage is spotty: Allocate just a small amount exclusively
// Do not cap in AWS as hosts are allocated on demand and 1-to-1, so the node can use the entire host
if (zone.environment() == Environment.dev && !zone.region().value().contains("aws-"))
resources = resources.withVcpu(0.1);
return resources;
}
private void assertMinimumResources(NodeResources resources, ClusterSpec cluster) {
double minMemoryGb = cluster.type() == ClusterSpec.Type.admin ? 2 : 4;
if (resources.memoryGb() >= minMemoryGb) return;
throw new IllegalArgumentException(String.format(Locale.ENGLISH,
"Must specify at least %.2f Gb of memory for %s cluster '%s', was: %.2f Gb",
minMemoryGb, cluster.type().name(), cluster.id().value(), resources.memoryGb()));
}
private NodeResources defaultNodeResources(ClusterSpec.Type clusterType) {
if (clusterType == ClusterSpec.Type.admin) {
return isUsingAdvertisedResources ?
new NodeResources(0.5, 4, 50, 0.3) :
new NodeResources(0.5, 2, 50, 0.3);
}
return isUsingAdvertisedResources ?
new NodeResources(2.0, 8, 50, 0.3) :
new NodeResources(1.5, 8, 50, 0.3);
}
/**
* 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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