1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
|
// Copyright Yahoo. 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 com.yahoo.vespa.flags.PermanentFlags;
import com.yahoo.vespa.hosted.provision.NodeRepository;
import java.util.function.Function;
/**
* Defines the policies for assigning cluster capacity in various environments
*
* @author bratseth
* @see NodeResourceLimits
*/
public class CapacityPolicies {
private final Zone zone;
private final Function<ClusterSpec.Type, Boolean> sharedHosts;
public CapacityPolicies(NodeRepository nodeRepository) {
this.zone = nodeRepository.zone();
this.sharedHosts = type -> PermanentFlags.SHARED_HOST.bindTo(nodeRepository.flagSource()).value().isEnabled(type.name());
}
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 target, Capacity capacity, ClusterSpec cluster) {
if (target.isUnspecified())
target = defaultNodeResources(cluster.type());
if (capacity.isRequired()) return target;
// Dev does not cap the cpu or network of containers since usage is spotty: Allocate just a small amount exclusively
if (zone.environment() == Environment.dev && !zone.getCloud().dynamicProvisioning())
target = target.withVcpu(0.1).withBandwidthGbps(0.1);
// Allow slow storage in zones which are not performance sensitive
if (zone.system().isCd() || zone.environment() == Environment.dev || zone.environment() == Environment.test)
target = target.with(NodeResources.DiskSpeed.any).with(NodeResources.StorageType.any).withBandwidthGbps(0.1);
return target;
}
public 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 zone.getCloud().dynamicProvisioning() && ! sharedHosts.apply(clusterType) ?
new NodeResources(0.5, 4, 50, 0.3) :
new NodeResources(0.5, 2, 50, 0.3);
}
return zone.getCloud().dynamicProvisioning() ?
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(Capacity capacity, boolean requestedExclusivity) {
return requestedExclusivity && (capacity.isRequired() || 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();
}
}
|
