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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.vespa.hosted.controller.maintenance;
import com.yahoo.text.Text;
import com.yahoo.vespa.hosted.controller.ApplicationController;
import com.yahoo.vespa.hosted.controller.Controller;
import com.yahoo.vespa.hosted.controller.Instance;
import com.yahoo.vespa.hosted.controller.api.application.v4.model.ClusterMetrics;
import com.yahoo.vespa.hosted.controller.api.identifiers.DeploymentId;
import com.yahoo.vespa.hosted.controller.api.integration.configserver.ApplicationReindexing;
import com.yahoo.vespa.hosted.controller.application.Deployment;
import com.yahoo.vespa.hosted.controller.application.DeploymentMetrics;
import com.yahoo.yolean.Exceptions;
import java.time.Duration;
import java.time.Instant;
import java.util.List;
import java.util.Optional;
import java.util.concurrent.ForkJoinPool;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.concurrent.atomic.AtomicReference;
import java.util.function.Function;
import java.util.logging.Level;
import java.util.logging.Logger;
/**
* Retrieves deployment metrics such as QPS and document count over the config server API
* and updates application objects in the controller with this info.
*
* @author smorgrav
* @author mpolden
*/
public class DeploymentMetricsMaintainer extends ControllerMaintainer {
private static final Logger log = Logger.getLogger(DeploymentMetricsMaintainer.class.getName());
private static final int applicationsToUpdateInParallel = 10;
private final ApplicationController applications;
public DeploymentMetricsMaintainer(Controller controller, Duration duration, Double successFactorBaseline) {
super(controller, duration, successFactorBaseline);
this.applications = controller.applications();
}
public DeploymentMetricsMaintainer(Controller controller, Duration duration) {
this(controller, duration, 1.0);
}
@Override
protected double maintain() {
AtomicInteger failures = new AtomicInteger(0);
AtomicInteger attempts = new AtomicInteger(0);
AtomicReference<Exception> lastException = new AtomicReference<>(null);
// Run parallel stream inside a custom ForkJoinPool so that we can control the number of threads used
ForkJoinPool pool = new ForkJoinPool(applicationsToUpdateInParallel);
pool.submit(() ->
applications.readable().parallelStream().forEach(application -> {
for (Instance instance : application.instances().values())
for (Deployment deployment : instance.deployments().values()) {
attempts.incrementAndGet();
try {
DeploymentId deploymentId = new DeploymentId(instance.id(), deployment.zone());
List<ClusterMetrics> clusterMetrics = controller().serviceRegistry().configServer().getDeploymentMetrics(deploymentId);
Instant now = controller().clock().instant();
applications.lockApplicationIfPresent(application.id(), locked -> {
Deployment existingDeployment = locked.get().require(instance.name()).deployments().get(deployment.zone());
if (existingDeployment == null) return; // Deployment removed since we started collecting metrics
DeploymentMetrics newMetrics = updateDeploymentMetrics(existingDeployment.metrics(), clusterMetrics).at(now);
applications.store(locked.with(instance.name(),
lockedInstance -> lockedInstance.with(existingDeployment.zone(), newMetrics)
.recordActivityAt(now, existingDeployment.zone())));
ApplicationReindexing applicationReindexing = controller().serviceRegistry().configServer().getReindexing(deploymentId);
controller().notificationsDb().setDeploymentMetricsNotifications(deploymentId, clusterMetrics, applicationReindexing);
});
} catch (Exception e) {
failures.incrementAndGet();
lastException.set(e);
}
}
})
);
pool.shutdown();
try {
Duration timeout = Duration.ofMinutes(30);
if (!pool.awaitTermination(timeout.toMillis(), TimeUnit.MILLISECONDS)) {
log.log(Level.WARNING, "Could not shut down metrics collection thread pool within " + timeout);
}
if (lastException.get() != null) {
log.log(Level.WARNING,
Text.format("Could not gather metrics for %d/%d deployments. Retrying in %s. Last error: %s",
failures.get(),
attempts.get(),
interval(),
Exceptions.toMessageString(lastException.get())));
}
} catch (InterruptedException e) {
throw new RuntimeException(e);
}
return asSuccessFactorDeviation(attempts.get(), failures.get());
}
static DeploymentMetrics updateDeploymentMetrics(DeploymentMetrics current, List<ClusterMetrics> metrics) {
return current
.withQueriesPerSecond(metrics.stream().flatMap(m -> m.queriesPerSecond().stream()).mapToDouble(Double::doubleValue).sum())
.withWritesPerSecond(metrics.stream().flatMap(m -> m.feedPerSecond().stream()).mapToDouble(Double::doubleValue).sum())
.withDocumentCount(metrics.stream().flatMap(m -> m.documentCount().stream()).mapToLong(Double::longValue).sum())
.withQueryLatencyMillis(weightedAverageLatency(metrics, ClusterMetrics::queriesPerSecond, ClusterMetrics::queryLatency))
.withWriteLatencyMillis(weightedAverageLatency(metrics, ClusterMetrics::feedPerSecond, ClusterMetrics::feedLatency));
}
private static double weightedAverageLatency(List<ClusterMetrics> metrics,
Function<ClusterMetrics, Optional<Double>> rateExtractor,
Function<ClusterMetrics, Optional<Double>> latencyExtractor) {
double rateSum = metrics.stream().flatMap(m -> rateExtractor.apply(m).stream()).mapToDouble(Double::longValue).sum();
if (rateSum == 0) return 0.0;
double weightedLatency = metrics.stream()
.flatMap(m -> latencyExtractor.apply(m).flatMap(l -> rateExtractor.apply(m).map(r -> l * r)).stream())
.mapToDouble(Double::doubleValue)
.sum();
return weightedLatency / rateSum;
}
}
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