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
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
|
// Copyright Verizon Media. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.vespa.hosted.provision.maintenance;
import com.yahoo.config.provision.ApplicationId;
import com.yahoo.config.provision.ClusterResources;
import com.yahoo.config.provision.ClusterSpec;
import com.yahoo.config.provision.Deployer;
import com.yahoo.jdisc.Metric;
import com.yahoo.vespa.hosted.provision.Node;
import com.yahoo.vespa.hosted.provision.NodeList;
import com.yahoo.vespa.hosted.provision.NodeRepository;
import com.yahoo.vespa.hosted.provision.applications.Application;
import com.yahoo.vespa.hosted.provision.applications.Applications;
import com.yahoo.vespa.hosted.provision.applications.Cluster;
import com.yahoo.vespa.hosted.provision.autoscale.AllocatableClusterResources;
import com.yahoo.vespa.hosted.provision.autoscale.Autoscaler;
import com.yahoo.vespa.hosted.provision.autoscale.NodeMetricSnapshot;
import com.yahoo.vespa.hosted.provision.autoscale.MetricsDb;
import com.yahoo.vespa.hosted.provision.autoscale.NodeTimeseries;
import com.yahoo.vespa.hosted.provision.node.History;
import java.time.Duration;
import java.time.Instant;
import java.util.List;
import java.util.Map;
import java.util.Optional;
import java.util.stream.Collectors;
/**
* Maintainer making automatic scaling decisions
*
* @author bratseth
*/
public class AutoscalingMaintainer extends NodeRepositoryMaintainer {
private final Autoscaler autoscaler;
private final MetricsDb metricsDb;
private final Deployer deployer;
private final Metric metric;
public AutoscalingMaintainer(NodeRepository nodeRepository,
MetricsDb metricsDb,
Deployer deployer,
Metric metric,
Duration interval) {
super(nodeRepository, interval, metric);
this.autoscaler = new Autoscaler(metricsDb, nodeRepository);
this.metricsDb = metricsDb;
this.deployer = deployer;
this.metric = metric;
}
@Override
protected boolean maintain() {
if ( ! nodeRepository().nodes().isWorking()) return false;
boolean success = true;
if ( ! nodeRepository().zone().environment().isProduction()) return success;
activeNodesByApplication().forEach((applicationId, nodes) -> autoscale(applicationId, nodes));
return success;
}
private void autoscale(ApplicationId application, List<Node> applicationNodes) {
try (MaintenanceDeployment deployment = new MaintenanceDeployment(application, deployer, metric, nodeRepository())) {
if ( ! deployment.isValid()) return;
nodesByCluster(applicationNodes).forEach((clusterId, clusterNodes) -> autoscale(application, clusterId, NodeList.copyOf(clusterNodes), deployment));
}
}
private void autoscale(ApplicationId applicationId,
ClusterSpec.Id clusterId,
NodeList clusterNodes,
MaintenanceDeployment deployment) {
Application application = nodeRepository().applications().get(applicationId).orElse(Application.empty(applicationId));
if (application.cluster(clusterId).isEmpty()) return;
Cluster cluster = application.cluster(clusterId).get();
cluster = updateCompletion(cluster, clusterNodes);
var advice = autoscaler.autoscale(application, cluster, clusterNodes);
cluster = cluster.withAutoscalingStatus(advice.reason());
if (advice.isPresent() && !cluster.targetResources().equals(advice.target())) { // autoscale
cluster = cluster.withTarget(advice.target());
applications().put(application.with(cluster), deployment.applicationLock().get());
if (advice.target().isPresent()) {
logAutoscaling(advice.target().get(), applicationId, cluster, clusterNodes);
deployment.activate();
}
}
else { // store cluster update
applications().put(application.with(cluster), deployment.applicationLock().get());
}
}
private Applications applications() {
return nodeRepository().applications();
}
/** Check if the last scaling event for this cluster has completed and if so record it in the returned instance */
private Cluster updateCompletion(Cluster cluster, NodeList clusterNodes) {
if (cluster.lastScalingEvent().isEmpty()) return cluster;
var event = cluster.lastScalingEvent().get();
if (event.completion().isPresent()) return cluster;
// Scaling event is complete if:
// - 1. no nodes which was retired by this are still present (which also implies data distribution is complete)
if (clusterNodes.retired().stream()
.anyMatch(node -> node.history().hasEventAt(History.Event.Type.retired, event.at())))
return cluster;
// - 2. all nodes have switched to the right config generation
for (NodeTimeseries nodeTimeseries : metricsDb.getNodeTimeseries(Duration.between(event.at(), clock().instant()),
clusterNodes)) {
Optional<NodeMetricSnapshot> firstOnNewGeneration =
nodeTimeseries.asList().stream()
.filter(snapshot -> snapshot.generation() >= event.generation()).findFirst();
if (firstOnNewGeneration.isEmpty()) return cluster; // Not completed
}
// Set the completion time to the instant we notice completion.
Instant completionTime = nodeRepository().clock().instant();
return cluster.with(event.withCompletion(completionTime));
}
private void logAutoscaling(ClusterResources target,
ApplicationId application,
Cluster cluster,
NodeList clusterNodes) {
ClusterResources current = new AllocatableClusterResources(clusterNodes.asList(), nodeRepository(), cluster.exclusive()).advertisedResources();
log.info("Autoscaling " + application + " " + clusterNodes.clusterSpec() + ":" +
"\nfrom " + toString(current) + "\nto " + toString(target));
}
static String toString(ClusterResources r) {
return r + " (total: " + r.totalResources() + ")";
}
private Map<ClusterSpec.Id, List<Node>> nodesByCluster(List<Node> applicationNodes) {
return applicationNodes.stream().collect(Collectors.groupingBy(n -> n.allocation().get().membership().cluster().id()));
}
}
|
