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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.ApplicationLockException;
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.flags.BooleanFlag;
import com.yahoo.vespa.flags.FetchVector;
import com.yahoo.vespa.flags.PermanentFlags;
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.AllocatableResources;
import com.yahoo.vespa.hosted.provision.autoscale.Autoscaler;
import com.yahoo.vespa.hosted.provision.autoscale.Autoscaling;
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;
private final BooleanFlag enabledFlag;
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;
this.enabledFlag = PermanentFlags.AUTOSCALING.bindTo(nodeRepository.flagSource());
}
@Override
protected double maintain() {
if ( ! nodeRepository().nodes().isWorking()) return 0.0;
if (nodeRepository().zone().environment().isTest()) return 1.0;
int attempts = 0;
int failures = 0;
for (var applicationNodes : activeNodesByApplication().entrySet()) {
boolean enabled = enabledFlag.with(FetchVector.Dimension.APPLICATION_ID,
applicationNodes.getKey().serializedForm()).value();
if (!enabled) continue;
for (var clusterNodes : nodesByCluster(applicationNodes.getValue()).entrySet()) {
attempts++;
if ( ! autoscale(applicationNodes.getKey(), clusterNodes.getKey()))
failures++;
}
}
return asSuccessFactorDeviation(attempts, failures);
}
/**
* Autoscales the given cluster.
*
* @return true if an autoscaling decision was made or nothing should be done, false if there was an error
*/
private boolean autoscale(ApplicationId applicationId, ClusterSpec.Id clusterId) {
boolean redeploy = false;
try (var lock = nodeRepository().applications().lock(applicationId)) {
Optional<Application> application = nodeRepository().applications().get(applicationId);
if (application.isEmpty()) return true;
if (application.get().cluster(clusterId).isEmpty()) return true;
Cluster cluster = application.get().cluster(clusterId).get();
Cluster unchangedCluster = cluster;
NodeList clusterNodes = nodeRepository().nodes().list(Node.State.active).owner(applicationId).cluster(clusterId);
cluster = updateCompletion(cluster, clusterNodes);
var current = new AllocatableResources(clusterNodes.not().retired(), nodeRepository()).advertisedResources();
// Autoscale unless an autoscaling is already in progress
Autoscaling autoscaling = null;
if (cluster.target().resources().isEmpty() && !cluster.scalingInProgress()) {
autoscaling = autoscaler.autoscale(application.get(), cluster, clusterNodes);
if (autoscaling.isPresent() || cluster.target().isEmpty()) // Ignore empty from recently started servers
cluster = cluster.withTarget(autoscaling);
}
// Always store any updates
if (cluster != unchangedCluster)
applications().put(application.get().with(cluster), lock);
// Attempt to perform the autoscaling immediately, and log it regardless
if (autoscaling != null && autoscaling.resources().isPresent() && !current.equals(autoscaling.resources().get())) {
redeploy = true;
logAutoscaling(current, autoscaling.resources().get(), applicationId, clusterNodes.not().retired());
}
}
catch (ApplicationLockException e) {
return false;
}
catch (IllegalArgumentException e) {
throw new IllegalArgumentException("Illegal arguments for " + applicationId + " cluster " + clusterId, e);
}
if (redeploy) {
try (MaintenanceDeployment deployment = new MaintenanceDeployment(applicationId, deployer, metric, nodeRepository())) {
if (deployment.isValid())
deployment.activate();
}
}
return true;
}
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 (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("Autoscaling " + 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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