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// Copyright Yahoo. 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.config.provision.Environment;
import com.yahoo.jdisc.Metric;
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.node.History;
import java.time.Duration;
import java.time.Instant;
import java.util.Map;
import java.util.Optional;
/**
* Maintainer making automatic scaling decisions
*
* @author bratseth
*/
public class AutoscalingMaintainer extends NodeRepositoryMaintainer {
private final Autoscaler autoscaler;
private final Deployer deployer;
private final Metric metric;
public AutoscalingMaintainer(NodeRepository nodeRepository,
Deployer deployer,
Metric metric,
Duration interval) {
super(nodeRepository, interval, metric);
this.autoscaler = new Autoscaler(nodeRepository);
this.deployer = deployer;
this.metric = metric;
}
@Override
protected double maintain() {
if ( ! nodeRepository().nodes().isWorking()) return 0.0;
if ( ! nodeRepository().zone().environment().isAnyOf(Environment.dev, Environment.perf, Environment.prod)) return 1.0;
activeNodesByApplication().forEach(this::autoscale);
return 1.0;
}
private void autoscale(ApplicationId application, NodeList applicationNodes) {
try {
nodesByCluster(applicationNodes).forEach((clusterId, clusterNodes) -> autoscale(application, clusterId, clusterNodes));
}
catch (IllegalArgumentException e) {
throw new IllegalArgumentException("Illegal arguments for " + application, e);
}
}
private void autoscale(ApplicationId applicationId, ClusterSpec.Id clusterId, NodeList clusterNodes) {
Optional<Application> application = nodeRepository().applications().get(applicationId);
if (application.isEmpty()) return;
Optional<Cluster> cluster = application.get().cluster(clusterId);
if (cluster.isEmpty()) return;
Cluster updatedCluster = updateCompletion(cluster.get(), clusterNodes);
var advice = autoscaler.autoscale(application.get(), updatedCluster, clusterNodes);
// Lock and write if there are state updates and/or we should autoscale now
if (advice.isPresent() && !cluster.get().targetResources().equals(advice.target()) ||
(updatedCluster != cluster.get() || !advice.reason().equals(cluster.get().autoscalingStatus()))) {
try (var lock = nodeRepository().applications().lock(applicationId)) {
application = nodeRepository().applications().get(applicationId);
if (application.isEmpty()) return;
cluster = application.get().cluster(clusterId);
if (cluster.isEmpty()) return;
// 1. Update cluster info
updatedCluster = updateCompletion(cluster.get(), clusterNodes)
.with(advice.reason())
.withTarget(advice.target());
applications().put(application.get().with(updatedCluster), lock);
if (advice.isPresent() && advice.target().isPresent() && !cluster.get().targetResources().equals(advice.target())) {
// 2. Also autoscale
ClusterResources before = new AllocatableClusterResources(clusterNodes, nodeRepository()).advertisedResources();
try (MaintenanceDeployment deployment = new MaintenanceDeployment(applicationId, deployer, metric, nodeRepository())) {
if (deployment.isValid()) {
deployment.activate();
logAutoscaling(before, advice.target().get(), applicationId, clusterNodes);
}
}
}
}
}
}
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 (currently only measured on containers)
for (var nodeTimeseries : nodeRepository().metricsDb().getNodeTimeseries(Duration.between(event.at(), clock().instant()),
clusterNodes)) {
Optional<NodeMetricSnapshot> onNewGeneration =
nodeTimeseries.asList().stream()
.filter(snapshot -> snapshot.generation() >= event.generation()).findAny();
if (onNewGeneration.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 from, ClusterResources to, ApplicationId application, NodeList clusterNodes) {
log.info("Autoscaled " + application + " " + clusterNodes.clusterSpec() + ":" +
"\nfrom " + toString(from) + "\nto " + toString(to));
}
static String toString(ClusterResources r) {
return r + " (total: " + r.totalResources() + ")";
}
private Map<ClusterSpec.Id, NodeList> nodesByCluster(NodeList applicationNodes) {
return applicationNodes.groupingBy(n -> n.allocation().get().membership().cluster().id());
}
}
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