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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.hosted.provision.Node;
import com.yahoo.vespa.hosted.provision.NodeList;
import com.yahoo.vespa.hosted.provision.NodeRepository;
import com.yahoo.vespa.hosted.provision.node.Agent;
import com.yahoo.vespa.hosted.provision.node.ClusterId;
import com.yahoo.vespa.hosted.provision.node.filter.NodeListFilter;
import java.time.Instant;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashSet;
import java.util.List;
import java.util.Optional;
import java.util.Set;
import java.util.logging.Logger;
/**
* An upgrader that rebuilds hosts on stale OS versions.
*
* - We limit the number of concurrent rebuilds to reduce impact of suspending or retiring too many hosts.
* - We limit rebuilds by cluster so that at most one node per stateful cluster per application is rebuilt at a time.
*
* Used in cases where performing an OS upgrade requires rebuilding the host, e.g. when upgrading across major versions.
*
* @author mpolden
*/
public class RebuildingOsUpgrader extends OsUpgrader {
private static final Logger LOG = Logger.getLogger(RebuildingOsUpgrader.class.getName());
private final boolean softRebuild;
public RebuildingOsUpgrader(NodeRepository nodeRepository, boolean softRebuild) {
super(nodeRepository);
this.softRebuild = softRebuild;
}
@Override
public void upgradeTo(OsVersionTarget target) {
NodeList allNodes = nodeRepository.nodes().list();
Instant now = nodeRepository.clock().instant();
rebuildableHosts(target, allNodes, now).forEach(host -> rebuild(host, target.version(), now));
}
@Override
public void disableUpgrade(NodeType type) {
// No action needed in this implementation. Hosts that have started rebuilding cannot be halted
}
private List<Node> rebuildableHosts(OsVersionTarget target, NodeList allNodes, Instant now) {
NodeList hostsOfTargetType = allNodes.nodeType(target.nodeType());
if (softRebuild) {
// Soft rebuild is enabled so this should act on hosts having replaceable root disk
hostsOfTargetType = hostsOfTargetType.replaceableRootDisk();
}
// Find stateful clusters with retiring nodes
NodeList activeNodes = allNodes.state(Node.State.active);
Set<ClusterId> retiringClusters = new HashSet<>(activeNodes.nodeType(target.nodeType().childNodeType())
.retiring()
.statefulClusters());
// Rebuild hosts not containing stateful clusters with retiring nodes, up to rebuild limit
NodeList hosts = hostsOfTargetType.state(Node.State.active, Node.State.provisioned);
int rebuildLimit = upgradeSlots(target, hosts.rebuilding(softRebuild));
List<Node> hostsToRebuild = new ArrayList<>(rebuildLimit);
NodeList candidates = hosts.not().rebuilding(softRebuild)
.not().onOsVersion(target.version())
.matching(node -> canUpgradeAt(now, node))
.byIncreasingOsVersion();
for (Node host : candidates) {
if (hostsToRebuild.size() == rebuildLimit) break;
Set<ClusterId> clustersOnHost = activeNodes.childrenOf(host).statefulClusters();
boolean canRebuild = Collections.disjoint(retiringClusters, clustersOnHost);
if (canRebuild) {
hostsToRebuild.add(host);
retiringClusters.addAll(clustersOnHost);
}
}
return Collections.unmodifiableList(hostsToRebuild);
}
private void rebuild(Node host, Version target, Instant now) {
LOG.info((softRebuild ? "Soft-rebuilding " : "Retiring and rebuilding ") + host + ": On stale OS version " +
host.status().osVersion().current().map(Version::toFullString).orElse("<unset>") +
", want " + target);
nodeRepository.nodes().rebuild(host.hostname(), softRebuild, Agent.RebuildingOsUpgrader, now);
nodeRepository.nodes().upgradeOs(NodeListFilter.from(host), Optional.of(target));
}
}
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