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// 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.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.MetricsDb;
import com.yahoo.vespa.orchestrator.status.ApplicationLock;
import java.time.Duration;
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 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.metric = metric;
this.deployer = deployer;
}
@Override
protected boolean maintain() {
if ( ! nodeRepository().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, clusterNodes, deployment));
}
}
private void autoscale(ApplicationId applicationId,
ClusterSpec.Id clusterId,
List<Node> clusterNodes,
MaintenanceDeployment deployment) {
Application application = nodeRepository().applications().get(applicationId).orElse(new Application(applicationId));
if (application.cluster(clusterId).isEmpty()) return;
Cluster cluster = application.cluster(clusterId).get();
var advice = autoscaler.autoscale(cluster, clusterNodes);
cluster = cluster.withAutoscalingStatus(advice.reason());
if (advice.isEmpty()) {
applications().put(application.with(cluster), deployment.applicationLock().get());
} else if (!cluster.targetResources().equals(advice.target())) {
applications().put(application.with(cluster.withTarget(advice.target())), deployment.applicationLock().get());
if (advice.target().isPresent()) {
logAutoscaling(advice.target().get(), applicationId, cluster, clusterNodes);
deployment.activate();
}
}
}
private Applications applications() {
return nodeRepository().applications();
}
private void logAutoscaling(ClusterResources target,
ApplicationId application,
Cluster cluster,
List<Node> clusterNodes) {
ClusterResources current = new AllocatableClusterResources(clusterNodes, nodeRepository(), cluster.exclusive()).toAdvertisedClusterResources();
ClusterSpec.Type clusterType = clusterNodes.get(0).allocation().get().membership().cluster().type();
log.info("Autoscaling " + application + " " + clusterType + " " + cluster.id() + ":" +
"\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()));
}
}
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