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// Copyright 2017 Yahoo Holdings. 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.config.provision.Deployment;
import com.yahoo.transaction.Mutex;
import com.yahoo.vespa.hosted.provision.Node;
import com.yahoo.vespa.hosted.provision.NodeRepository;
import java.time.Duration;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Optional;
import java.util.Set;
import java.util.concurrent.Executor;
import java.util.concurrent.Executors;
import java.util.logging.Level;
import java.util.stream.Collectors;
/**
* @author bratseth
* @author mpolden
*/
public abstract class ApplicationMaintainer extends Maintainer {
private final Deployer deployer;
// 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 Executor deploymentExecutor = Executors.newSingleThreadExecutor(new DaemonThreadFactory("node repo application maintainer"));
protected ApplicationMaintainer(Deployer deployer, NodeRepository nodeRepository, Duration interval, JobControl jobControl) {
super(nodeRepository, interval, jobControl);
this.deployer = deployer;
}
@Override
protected final void maintain() {
Set<ApplicationId> applications = applicationsNeedingMaintenance();
for (ApplicationId application : applications) {
if (canDeployNow(application))
deploy(application);
}
}
protected boolean canDeployNow(ApplicationId application) {
return true;
}
/**
* 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) {
deploymentExecutor.execute(() -> deployWithLock(application));
}
protected Deployer deployer() { return deployer; }
protected Set<ApplicationId> applicationsNeedingMaintenance() {
return nodesNeedingMaintenance().stream()
.map(node -> node.allocation().get().owner())
.collect(Collectors.toCollection(LinkedHashSet::new));
}
/**
* Returns the nodes whose applications should be maintained by this now.
* This should be some subset of the allocated nodes.
*/
protected abstract List<Node> nodesNeedingMaintenance();
/** Redeploy this application. A lock will be taken for the duration of the deployment activation */
final void deployWithLock(ApplicationId application) {
// An application might change it's state between the time the set of applications is retrieved and the
// time deployment happens. Lock the application and check if it's still active.
//
// Lock is acquired with a low timeout to reduce the chance of colliding with an external deployment.
try (Mutex lock = nodeRepository().lock(application, Duration.ofSeconds(1))) {
if ( ! isActive(application)) return; // became inactive since deployment was requested
Optional<Deployment> deployment = deployer.deployFromLocalActive(application);
if ( ! deployment.isPresent()) return; // this will be done at another config server
deployment.get().activate();
} catch (RuntimeException e) {
log.log(Level.WARNING, "Exception on maintenance redeploy", e);
}
}
/** Returns true when application has at least one active node */
private boolean isActive(ApplicationId application) {
return ! nodeRepository().getNodes(application, Node.State.active).isEmpty();
}
}
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