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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.provision.maintenance;
import com.yahoo.concurrent.DaemonThreadFactory;
import com.yahoo.config.provision.ApplicationId;
import com.yahoo.config.provision.Deployer;
import com.yahoo.jdisc.Metric;
import com.yahoo.vespa.hosted.provision.NodeRepository;
import java.time.Duration;
import java.time.Instant;
import java.util.Map;
import java.util.concurrent.CopyOnWriteArrayList;
import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;
import java.util.logging.Level;
/**
* @author bratseth
* @author mpolden
*/
public abstract class ApplicationMaintainer extends NodeRepositoryMaintainer {
private final Deployer deployer;
private final Metric metric;
private final CopyOnWriteArrayList<ApplicationId> pendingDeployments = new CopyOnWriteArrayList<>();
// Use a fixed thread pool to avoid overload on config servers. Resource usage when deploying varies
// a lot between applications, so doing one by one avoids issues where one or more resource-demanding
// deployments happen simultaneously
private final ThreadPoolExecutor deploymentExecutor = new ThreadPoolExecutor(1, 1,
0L, TimeUnit.MILLISECONDS,
new LinkedBlockingQueue<>(),
new DaemonThreadFactory("node repo application maintainer"));
protected ApplicationMaintainer(Deployer deployer, Metric metric, NodeRepository nodeRepository, Duration interval) {
super(nodeRepository, interval, metric);
this.deployer = deployer;
this.metric = metric;
}
@Override
protected final double maintain() {
applicationsNeedingMaintenance().forEach(this::deploy);
return 1.0;
}
protected final Deployer deployer() { return deployer; }
/** Returns the number of deployments that are pending execution */
public int pendingDeployments() {
return pendingDeployments.size();
}
/** Returns whether given application should be deployed at this moment in time */
protected abstract boolean canDeployNow(ApplicationId application);
/** Returns the applications that should be maintained by this now. */
protected abstract Map<ApplicationId, String> applicationsNeedingMaintenance();
/**
* Redeploy this application.
*
* The default implementation deploys asynchronously to make sure we do all applications timely
* even when deployments are slow.
*/
protected void deploy(ApplicationId application, String reason) {
if (pendingDeployments.addIfAbsent(application)) { // Avoid queuing multiple deployments for same application
deploymentExecutor.execute(() -> deployNow(application, reason));
}
}
/**
* Redeploy this application. A lock will be taken for the duration of the deployment activation
*/
protected final void deployNow(ApplicationId application, String reason) {
try (MaintenanceDeployment deployment = new MaintenanceDeployment(application, deployer, metric, nodeRepository())) {
if ( ! deployment.isValid()) return; // this will be done at another config server
if ( ! canDeployNow(application)) return; // redeployment is no longer needed
log.log(Level.INFO, () -> application + " will be redeployed" +
(reason == null || reason.isBlank() ? "" : " due to " + reason) +
", last deployed " + deployTime(application) + " and last activated " + activationTime(application));
deployment.activate();
} finally {
pendingDeployments.remove(application);
}
}
/** Returns the last time application was activated. Epoch is returned if the application has never been activated. */
protected final Instant activationTime(ApplicationId application) {
return deployer.activationTime(application).orElse(Instant.EPOCH);
}
/** Returns the last time application was deployed. Epoch is returned if the application has never been deployed. */
protected final Instant deployTime(ApplicationId application) {
return deployer.deployTime(application).orElse(Instant.EPOCH);
}
@Override
public void shutdown() {
super.shutdown();
deploymentExecutor.shutdown();
}
@Override
public void awaitShutdown() {
Instant deadline = clock().instant().plus(Duration.ofMinutes(1));
super.awaitShutdown();
try {
long remainder = Duration.between(clock().instant(), deadline).toMillis();
if (deploymentExecutor.isShutdown()) return;
// Give deployments in progress some time to complete
if (remainder < 0 || !deploymentExecutor.awaitTermination(remainder, TimeUnit.MILLISECONDS)) {
log.log(Level.WARNING, "Failed to shut down deployment executor within deadline");
deploymentExecutor.shutdownNow();
}
} catch (InterruptedException e) {
throw new RuntimeException(e);
}
}
}
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