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// Copyright 2018 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.config.provision.ApplicationId;
import com.yahoo.log.LogLevel;
import com.yahoo.vespa.curator.Lock;
import com.yahoo.vespa.hosted.provision.NodeRepository;
import com.yahoo.vespa.hosted.provision.lb.LoadBalancer;
import com.yahoo.vespa.hosted.provision.lb.LoadBalancerId;
import com.yahoo.vespa.hosted.provision.lb.LoadBalancerService;
import com.yahoo.vespa.hosted.provision.persistence.CuratorDatabaseClient;
import java.time.Duration;
import java.util.ArrayList;
import java.util.List;
import java.util.Objects;
import java.util.stream.Collectors;
/**
* Periodically remove inactive load balancers permanently.
*
* When an application is removed, any associated load balancers are only deactivated. This maintainer ensures that
* underlying load balancer instances are eventually freed.
*
* @author mpolden
*/
public class LoadBalancerExpirer extends Maintainer {
private final LoadBalancerService service;
private final CuratorDatabaseClient db;
LoadBalancerExpirer(NodeRepository nodeRepository, Duration interval, LoadBalancerService service) {
super(nodeRepository, interval);
this.service = Objects.requireNonNull(service, "service must be non-null");
this.db = nodeRepository.database();
}
@Override
protected void maintain() {
removeInactive();
}
private void removeInactive() {
List<LoadBalancerId> failed = new ArrayList<>();
Exception lastException = null;
try (Lock lock = db.lockLoadBalancers()) {
for (LoadBalancer loadBalancer : nodeRepository().loadBalancers().inactive().asList()) {
if (hasNodes(loadBalancer.id().application())) { // Defer removal if there are still nodes allocated to application
continue;
}
try {
service.remove(loadBalancer.id().application(), loadBalancer.id().cluster());
db.removeLoadBalancer(loadBalancer.id());
} catch (Exception e) {
failed.add(loadBalancer.id());
lastException = e;
}
}
}
if (!failed.isEmpty()) {
log.log(LogLevel.WARNING, String.format("Failed to remove %d load balancers: %s, retrying in %s",
failed.size(),
failed.stream()
.map(LoadBalancerId::serializedForm)
.collect(Collectors.joining(", ")),
interval()),
lastException);
}
}
private boolean hasNodes(ApplicationId application) {
return !nodeRepository().getNodes(application).isEmpty();
}
}
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