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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.vespa.hosted.provision.provisioning;
import com.yahoo.component.Version;
import com.yahoo.config.provision.ApplicationId;
import com.yahoo.config.provision.CloudAccount;
import com.yahoo.config.provision.ClusterSpec;
import com.yahoo.config.provision.NodeAllocationException;
import com.yahoo.config.provision.NodeResources;
import com.yahoo.config.provision.NodeType;
import com.yahoo.jdisc.Metric;
import com.yahoo.text.internal.SnippetGenerator;
import com.yahoo.transaction.Mutex;
import com.yahoo.vespa.hosted.provision.LockedNodeList;
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.IP;
import com.yahoo.vespa.hosted.provision.provisioning.HostProvisioner.HostSharing;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Optional;
import java.util.Set;
import java.util.function.Consumer;
import java.util.function.Predicate;
import java.util.function.Supplier;
import java.util.logging.Level;
import java.util.logging.Logger;
import java.util.stream.Collectors;
/**
* Performs preparation of node activation changes for a cluster of an application.
*
* @author bratseth
*/
public class Preparer {
private static final Mutex PROBE_LOCK = () -> {};
private static final Logger log = Logger.getLogger(Preparer.class.getName());
private final NodeRepository nodeRepository;
private final Optional<HostProvisioner> hostProvisioner;
private final Optional<LoadBalancerProvisioner> loadBalancerProvisioner;
private final ProvisioningThrottler throttler;
public Preparer(NodeRepository nodeRepository, Optional<HostProvisioner> hostProvisioner, Optional<LoadBalancerProvisioner> loadBalancerProvisioner, Metric metric) {
this.nodeRepository = nodeRepository;
this.hostProvisioner = hostProvisioner;
this.loadBalancerProvisioner = loadBalancerProvisioner;
this.throttler = new ProvisioningThrottler(nodeRepository, metric);
}
/**
* Ensure sufficient nodes are reserved or active for the given application, group and cluster
*
* @param application the application we are allocating to
* @param cluster the cluster and group we are allocating to
* @param requested a specification of the requested nodes
* @return the list of nodes this cluster group will have allocated if activated
*/
// Note: This operation may make persisted changes to the set of reserved and inactive nodes,
// but it may not change the set of active nodes, as the active nodes must stay in sync with the
// active config model which is changed on activate
public List<Node> prepare(ApplicationId application, ClusterSpec cluster, NodeSpec requested) {
log.log(Level.FINE, () -> "Preparing " + cluster.type().name() + " " + cluster.id() + " with requested resources " +
requested.resources().orElse(NodeResources.unspecified()));
loadBalancerProvisioner.ifPresent(provisioner -> provisioner.prepare(application, cluster, requested));
// Try preparing in memory without global unallocated lock. Most of the time there should be no changes,
// and we can return nodes previously allocated.
LockedNodeList allNodes = nodeRepository.nodes().list(PROBE_LOCK);
NodeIndices indices = new NodeIndices(cluster.id(), allNodes);
NodeAllocation probeAllocation = prepareAllocation(application, cluster, requested, indices::probeNext, allNodes);
if (probeAllocation.fulfilledAndNoChanges()) {
List<Node> acceptedNodes = probeAllocation.finalNodes();
indices.commitProbe();
return acceptedNodes;
} else {
// There were some changes, so re-do the allocation with locks
indices.resetProbe();
return prepareWithLocks(application, cluster, requested, indices);
}
}
/// Note that this will write to the node repo.
private List<Node> prepareWithLocks(ApplicationId application, ClusterSpec cluster, NodeSpec requested, NodeIndices indices) {
try (Mutex lock = nodeRepository.applications().lock(application);
Mutex allocationLock = nodeRepository.nodes().lockUnallocated()) {
LockedNodeList allNodes = nodeRepository.nodes().list(allocationLock);
NodeAllocation allocation = prepareAllocation(application, cluster, requested, indices::next, allNodes);
NodeType hostType = allocation.nodeType().hostType();
if (canProvisionDynamically(hostType) && allocation.hostDeficit().isPresent()) {
HostSharing sharing = hostSharing(cluster, hostType);
Version osVersion = nodeRepository.osVersions().targetFor(hostType).orElse(Version.emptyVersion);
NodeAllocation.HostDeficit deficit = allocation.hostDeficit().get();
Set<Node> hosts = new LinkedHashSet<>();
Consumer<List<ProvisionedHost>> whenProvisioned = provisionedHosts -> {
List<Node> newHosts = provisionedHosts.stream()
.map(host -> host.generateHost(requested.hostTTL()))
.filter(hosts::add)
.toList();
nodeRepository.nodes().addNodes(newHosts, Agent.application);
// Offer the nodes on the newly provisioned hosts, this should be enough to cover the deficit
List<NodeCandidate> candidates = provisionedHosts.stream()
.map(host -> NodeCandidate.createNewExclusiveChild(host.generateNode(),
host.generateHost(requested.hostTTL())))
.toList();
allocation.offer(candidates);
};
try {
if (throttler.throttle(allNodes, Agent.system)) {
throw new NodeAllocationException("Host provisioning is being throttled", true);
}
HostProvisionRequest request = new HostProvisionRequest(allocation.provisionIndices(deficit.count()),
hostType,
deficit.resources(),
application,
osVersion,
sharing,
Optional.of(cluster.type()),
Optional.of(cluster.id()),
requested.cloudAccount(),
deficit.dueToFlavorUpgrade());
Predicate<NodeResources> realHostResourcesWithinLimits = resources -> nodeRepository.nodeResourceLimits().isWithinRealLimits(resources, application, cluster);
hostProvisioner.get().provisionHosts(request, realHostResourcesWithinLimits, whenProvisioned);
} catch (NodeAllocationException e) {
// Mark the nodes that were written to ZK in the consumer for deprovisioning. While these hosts do
// not exist, we cannot remove them from ZK here because other nodes may already have been
// allocated on them, so let HostDeprovisioner deal with it
hosts.forEach(host -> nodeRepository.nodes().deprovision(host.hostname(), Agent.system, nodeRepository.clock().instant()));
throw e;
}
} else if (allocation.hostDeficit().isPresent() && requested.canFail() &&
allocation.hasRetiredJustNow() && requested instanceof NodeSpec.CountNodeSpec cns) {
// Non-dynamically provisioned zone with a deficit because we just now retired some nodes.
// Try again, but without retiring
indices.resetProbe();
List<Node> accepted = prepareWithLocks(application, cluster, cns.withoutRetiring(), indices);
log.warning("Prepared " + application + " " + cluster.id() + " without retirement due to lack of capacity");
return accepted;
}
if (! allocation.fulfilled() && requested.canFail())
throw new NodeAllocationException("Could not satisfy " + requested + " in " + application + " " + cluster +
allocation.allocationFailureDetails(), true);
// Carry out and return allocation
List<Node> acceptedNodes = allocation.finalNodes();
nodeRepository.nodes().reserve(allocation.reservableNodes());
nodeRepository.nodes().addReservedNodes(new LockedNodeList(allocation.newNodes(), allocationLock));
if (requested.rejectNonActiveParent()) { // TODO: Move into offer() - currently this must be done *after* reserving
NodeList activeHosts = allNodes.state(Node.State.active).parents().nodeType(requested.type().hostType());
acceptedNodes = acceptedNodes.stream()
.filter(node -> node.parentHostname().isEmpty() || activeHosts.parentOf(node).isPresent())
.toList();
}
return acceptedNodes;
}
}
private NodeAllocation prepareAllocation(ApplicationId application, ClusterSpec cluster, NodeSpec requested,
Supplier<Integer> nextIndex, LockedNodeList allNodes) {
validateAccount(requested.cloudAccount(), application, allNodes);
NodeAllocation allocation = new NodeAllocation(allNodes, application, cluster, requested, nextIndex, nodeRepository);
var allocationContext = IP.Allocation.Context.from(nodeRepository.zone().cloud().name(),
requested.cloudAccount().isExclave(nodeRepository.zone()),
nodeRepository.nameResolver());
NodePrioritizer prioritizer = new NodePrioritizer(allNodes,
application,
cluster,
requested,
nodeRepository.zone().cloud().dynamicProvisioning(),
allocationContext,
nodeRepository.nodes(),
nodeRepository.resourcesCalculator(),
nodeRepository.spareCount());
allocation.offer(prioritizer.collect());
return allocation;
}
private void validateAccount(CloudAccount requestedAccount, ApplicationId application, LockedNodeList allNodes) {
CloudAccount effectiveAccount = requestedAccount.isUnspecified() ? nodeRepository.zone().cloud().account() : requestedAccount;
List<Node> nodesInOtherAccount = allNodes.owner(application).nodeType(NodeType.tenant).stream()
.filter(node -> !node.cloudAccount().equals(effectiveAccount))
.toList();
if (nodesInOtherAccount.isEmpty()) return;
SnippetGenerator snippet = new SnippetGenerator();
String hostnames = nodesInOtherAccount.stream()
.map(Node::hostname)
.collect(Collectors.joining(", "));
String hostsSnippet = snippet.makeSnippet(hostnames, 100);
throw new IllegalArgumentException("Cannot allocate nodes in " + requestedAccount + " because " +
application + " has existing nodes in " + nodesInOtherAccount.get(0).cloudAccount() +
": " + hostsSnippet + ". Deployment must be removed in order to change account");
}
private boolean canProvisionDynamically(NodeType hostType) {
return nodeRepository.zone().cloud().dynamicProvisioning() &&
(hostType == NodeType.host || hostType.isConfigServerHostLike());
}
private HostSharing hostSharing(ClusterSpec cluster, NodeType hostType) {
if ( hostType.isSharable())
return nodeRepository.exclusiveAllocation(cluster) ? HostSharing.exclusive : HostSharing.any;
else
return HostSharing.any;
}
}
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