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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.ApplicationId;
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.SystemName;
import com.yahoo.config.provision.Zone;
import java.util.Locale;
/**
* Defines the policies for assigning cluster capacity in various environments
*
* @author bratseth
*/
public class CapacityPolicies {
private final Zone zone;
private final NodeResourceLimits nodeResourceLimits;
/* 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.nodeResourceLimits = new NodeResourceLimits(zone);
this.isUsingAdvertisedResources = zone.getCloud().dynamicProvisioning();
}
public int decideSize(int requested, Capacity capacity, ClusterSpec cluster, ApplicationId application) {
if (application.instance().isTester()) return 1;
ensureRedundancy(requested, cluster, capacity.canFail());
if (capacity.isRequired()) return requested;
switch(zone.environment()) {
case dev : case test : return 1;
case perf : return Math.min(requested, 3);
case staging: return requested <= 1 ? requested : Math.max(2, requested / 10);
case prod : return requested;
default : throw new IllegalArgumentException("Unsupported environment " + zone.environment());
}
}
public NodeResources decideNodeResources(NodeResources requested, Capacity capacity, ClusterSpec cluster) {
if (requested.isUnspecified())
requested = defaultNodeResources(cluster.type());
ensureSufficientResources(requested, cluster);
if (capacity.isRequired()) return requested;
// Allow slow storage in zones which are not performance sensitive
if (zone.system().isCd() || zone.environment() == Environment.dev || zone.environment() == Environment.test)
requested = requested.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-"))
requested = requested.withVcpu(0.1);
return requested;
}
private void ensureSufficientResources(NodeResources resources, ClusterSpec cluster) {
double minMemoryGb = nodeResourceLimits.minMemoryGb(cluster.type());
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) {
if (zone.system() == SystemName.dev) {
// Use small logserver in dev system
return new NodeResources(0.1, 1, 10, 0.3);
}
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
*
* @throws IllegalArgumentException if only one node is requested and we can fail
*/
private void ensureRedundancy(int nodeCount, ClusterSpec cluster, boolean canFail) {
if (canFail &&
nodeCount == 1 &&
requiresRedundancy(cluster.type()) &&
zone.environment().isProduction())
throw new IllegalArgumentException("Deployments to prod require at least 2 nodes per cluster for redundancy. Not fulfilled for " + cluster);
}
private static boolean requiresRedundancy(ClusterSpec.Type clusterType) {
return clusterType.isContent() || clusterType.isContainer();
}
}
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