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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.os;
import com.yahoo.component.Version;
import com.yahoo.config.provision.NodeType;
import com.yahoo.vespa.flags.IntFlag;
import com.yahoo.vespa.flags.PermanentFlags;
import com.yahoo.vespa.hosted.provision.Node;
import com.yahoo.vespa.hosted.provision.NodeList;
import com.yahoo.vespa.hosted.provision.NodeRepository;
import java.time.Duration;
import java.time.Instant;
import java.util.Objects;
import java.util.Set;
import java.util.logging.Level;
import java.util.logging.Logger;
/**
* Interface for an OS upgrader. Instances of this are created on-demand because multiple implementations may be used
* within a single zone. This and subclasses should not have any state.
*
* @author mpolden
*/
public abstract class OsUpgrader {
private final Logger LOG = Logger.getLogger(OsUpgrader.class.getName());
private final IntFlag maxActiveUpgrades;
final NodeRepository nodeRepository;
public OsUpgrader(NodeRepository nodeRepository) {
this.nodeRepository = Objects.requireNonNull(nodeRepository);
this.maxActiveUpgrades = PermanentFlags.MAX_OS_UPGRADES.bindTo(nodeRepository.flagSource());
}
/** Trigger upgrade to given target */
abstract void upgradeTo(OsVersionTarget target);
/** Disable OS upgrade for all nodes of given type */
abstract void disableUpgrade(NodeType type);
/** Returns the number of upgrade slots available for given target */
final int upgradeSlots(OsVersionTarget target, NodeList candidates) {
if (!candidates.stream().allMatch(node -> node.type() == target.nodeType())) {
throw new IllegalArgumentException("All node types must type of OS version target " + target.nodeType());
}
int max = target.nodeType() == NodeType.host ? maxActiveUpgrades.value() : 1;
int upgrading = candidates.changingOsVersionTo(target.version()).size();
return Math.max(0, max - upgrading);
}
/** Returns whether node can upgrade to version at given instant */
final boolean canUpgradeTo(Version version, Instant instant, Node node) {
if (deferringUpgrade(node, instant)) return false;
Set<Version> versions = nodeRepository.osVersions().availableTo(node, version);
boolean versionAvailable = versions.contains(version);
if (!versionAvailable) {
LOG.log(Level.WARNING, "Want to upgrade host " + node.hostname() + " to OS version " +
version.toFullString() + ", but this version does not exist in " +
node.cloudAccount() + ". Found " + versions.stream().sorted().toList());
}
return versionAvailable;
}
/** Returns whether node is deferring upgrade at given instant */
final boolean deferringUpgrade(Node node, Instant instant) {
return !node.status().osVersion().downgrading() && // Never defer downgrades
node.history().age(instant).compareTo(gracePeriod()) <= 0;
}
/** The duration this leaves new nodes alone before scheduling any upgrade */
private Duration gracePeriod() {
return nodeRepository.zone().system().isCd() ? Duration.ofHours(4) : Duration.ofDays(1);
}
}
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