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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.config.provision.NodeResources;
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.Autoscaler;
import com.yahoo.vespa.hosted.provision.autoscale.NodeMetricsDb;
import com.yahoo.vespa.hosted.provision.provisioning.HostResourcesCalculator;
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,
NodeMetricsDb metricsDb,
Deployer deployer,
Metric metric,
Duration interval) {
super(nodeRepository, interval);
this.autoscaler = new Autoscaler(metricsDb, nodeRepository);
this.metric = metric;
this.deployer = deployer;
}
@Override
protected void maintain() {
if ( ! nodeRepository().zone().environment().isProduction()) return;
activeNodesByApplication().forEach((applicationId, nodes) -> autoscale(applicationId, nodes));
}
private void autoscale(ApplicationId application, List<Node> applicationNodes) {
try (MaintenanceDeployment deployment = new MaintenanceDeployment(application, deployer, metric, nodeRepository())) {
if ( ! deployment.isValid()) return; // Another config server will consider this application
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));
Optional<Cluster> cluster = application.cluster(clusterId);
if (cluster.isEmpty()) return;
Optional<ClusterResources> target = autoscaler.autoscale(cluster.get(), clusterNodes);
if ( ! cluster.get().targetResources().equals(target))
applications().put(application.with(cluster.get().withTarget(target)), deployment.applicationLock().get());
if (target.isPresent()) {
logAutoscaling(target.get(), applicationId, clusterId, clusterNodes);
deployment.activate();
}
}
private Applications applications() {
return nodeRepository().applications();
}
private void logAutoscaling(ClusterResources target,
ApplicationId application,
ClusterSpec.Id clusterId,
List<Node> clusterNodes) {
int currentGroups = (int)clusterNodes.stream().map(node -> node.allocation().get().membership().cluster().group()).distinct().count();
ClusterSpec.Type clusterType = clusterNodes.get(0).allocation().get().membership().cluster().type();
log.info("Autoscaling " + application + " " + clusterType + " " + clusterId + ":" +
"\nfrom " + toString(clusterNodes.size(), currentGroups, clusterNodes.get(0).resources()) +
"\nto " + toString(target.nodes(), target.groups(), target.nodeResources()));
}
private String toString(int nodes, int groups, NodeResources resources) {
return String.format(nodes + (groups > 1 ? " (in " + groups + " groups)" : "") +
" * [vcpu: %0$.1f, memory: %1$.1f Gb, disk %2$.1f Gb]" +
" (total: [vcpu: %3$.1f, memory: %4$.1f Gb, disk: %5$.1f Gb])",
resources.vcpu(), resources.memoryGb(), resources.diskGb(),
nodes * resources.vcpu(), nodes * resources.memoryGb(), nodes * resources.diskGb());
}
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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