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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.jdisc.Metric;
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.provisioning.HostProvisioner;
import java.time.Duration;
import java.util.logging.Level;
import java.util.logging.Logger;
/**
* Deprovisions hosts that are no longer needed in dynamically provisioned systems.
*
* @author freva
*/
public class HostDeprovisioner extends NodeRepositoryMaintainer {
private static final Logger log = Logger.getLogger(HostDeprovisioner.class.getName());
private final HostProvisioner hostProvisioner;
HostDeprovisioner(NodeRepository nodeRepository, Duration interval, Metric metric, HostProvisioner hostProvisioner) {
super(nodeRepository, interval, metric);
this.hostProvisioner = hostProvisioner;
}
@Override
protected double maintain() {
NodeList allNodes = nodeRepository().nodes().list();
NodeList hosts = allNodes.parents().matching(HostCapacityMaintainer::canDeprovision);
int failures = 0;
for (Node host : hosts) {
// This shouldn't be possible since failed, parked, and wantToDeprovision should be recursive
if (!allNodes.childrenOf(host).stream().allMatch(HostCapacityMaintainer::canDeprovision))
continue;
try {
// Technically we should do this under application lock, but
// * HostProvisioner::deprovision may take some time since we are waiting for request(s) against
// the cloud provider
// * Because the application lock is shared between all hosts of the same type we want to avoid
// holding it over longer periods
// * We are about to remove these hosts anyway, so only reason we'd want to hold the lock is
// if we want to support aborting deprovision if operator manually intervenes
hostProvisioner.deprovision(host);
nodeRepository().nodes().removeRecursively(host, true);
} catch (RuntimeException e) {
failures++;
log.log(Level.WARNING, "Failed to deprovision " + host.hostname() + ", will retry in " + interval(), e);
}
}
return asSuccessFactorDeviation(hosts.size(), failures);
}
}
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