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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.google.inject.Inject;
import com.yahoo.config.provision.ActivationContext;
import com.yahoo.config.provision.ApplicationId;
import com.yahoo.config.provision.ApplicationTransaction;
import com.yahoo.config.provision.Capacity;
import com.yahoo.config.provision.ClusterResources;
import com.yahoo.config.provision.ClusterSpec;
import com.yahoo.config.provision.HostFilter;
import com.yahoo.config.provision.HostSpec;
import com.yahoo.config.provision.NodeResources;
import com.yahoo.config.provision.NodeType;
import com.yahoo.config.provision.ProvisionLock;
import com.yahoo.config.provision.ProvisionLogger;
import com.yahoo.config.provision.Provisioner;
import com.yahoo.config.provision.Zone;
import com.yahoo.transaction.Mutex;
import com.yahoo.vespa.flags.FlagSource;
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.applications.Application;
import com.yahoo.vespa.hosted.provision.applications.Cluster;
import com.yahoo.vespa.hosted.provision.autoscale.AllocatableClusterResources;
import com.yahoo.vespa.hosted.provision.autoscale.AllocationOptimizer;
import com.yahoo.vespa.hosted.provision.autoscale.ClusterModel;
import com.yahoo.vespa.hosted.provision.autoscale.Limits;
import com.yahoo.vespa.hosted.provision.autoscale.ResourceTarget;
import com.yahoo.vespa.hosted.provision.node.Allocation;
import com.yahoo.vespa.hosted.provision.node.filter.ApplicationFilter;
import com.yahoo.vespa.hosted.provision.node.filter.NodeHostFilter;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Comparator;
import java.util.List;
import java.util.Optional;
import java.util.logging.Level;
import java.util.logging.Logger;
/**
* Implementation of the host provisioner API for hosted Vespa, using the node repository to allocate nodes.
* Does not allocate hosts for the routing application, see VespaModelFactory.createHostProvisioner
*
* @author bratseth
*/
public class NodeRepositoryProvisioner implements Provisioner {
private static final Logger log = Logger.getLogger(NodeRepositoryProvisioner.class.getName());
private final NodeRepository nodeRepository;
private final AllocationOptimizer allocationOptimizer;
private final CapacityPolicies capacityPolicies;
private final Zone zone;
private final Preparer preparer;
private final Activator activator;
private final Optional<LoadBalancerProvisioner> loadBalancerProvisioner;
private final NodeResourceLimits nodeResourceLimits;
@Inject
public NodeRepositoryProvisioner(NodeRepository nodeRepository,
Zone zone,
ProvisionServiceProvider provisionServiceProvider, FlagSource flagSource) {
this.nodeRepository = nodeRepository;
this.allocationOptimizer = new AllocationOptimizer(nodeRepository);
this.capacityPolicies = new CapacityPolicies(nodeRepository);
this.zone = zone;
this.loadBalancerProvisioner = provisionServiceProvider.getLoadBalancerService(nodeRepository)
.map(lbService -> new LoadBalancerProvisioner(nodeRepository, lbService));
this.nodeResourceLimits = new NodeResourceLimits(nodeRepository);
this.preparer = new Preparer(nodeRepository,
provisionServiceProvider.getHostProvisioner(),
loadBalancerProvisioner);
this.activator = new Activator(nodeRepository, loadBalancerProvisioner);
}
/**
* Returns a list of nodes in the prepared or active state, matching the given constraints.
* The nodes are ordered by increasing index number.
*/
@Override
public List<HostSpec> prepare(ApplicationId application, ClusterSpec cluster, Capacity requested,
ProvisionLogger logger) {
log.log(Level.FINE, () -> "Received deploy prepare request for " + requested +
" for application " + application + ", cluster " + cluster);
if (cluster.group().isPresent()) throw new IllegalArgumentException("Node requests cannot specify a group");
nodeResourceLimits.ensureWithinAdvertisedLimits("Min", requested.minResources().nodeResources(), cluster);
nodeResourceLimits.ensureWithinAdvertisedLimits("Max", requested.maxResources().nodeResources(), cluster);
int groups;
NodeResources resources;
NodeSpec nodeSpec;
if (requested.type() == NodeType.tenant) {
ClusterResources target = decideTargetResources(application, cluster, requested);
int nodeCount = capacityPolicies.decideSize(target.nodes(),
requested.isRequired(),
requested.canFail(),
application.instance().isTester(),
cluster);
groups = Math.min(target.groups(), nodeCount); // cannot have more groups than nodes
resources = capacityPolicies.decideNodeResources(target.nodeResources(), requested.isRequired(), cluster);
boolean exclusive = capacityPolicies.decideExclusivity(requested, cluster.isExclusive());
nodeSpec = NodeSpec.from(nodeCount, resources, exclusive, requested.canFail());
logIfDownscaled(target.nodes(), nodeCount, cluster, logger);
}
else {
groups = 1; // type request with multiple groups is not supported
resources = requested.minResources().nodeResources();
nodeSpec = NodeSpec.from(requested.type());
}
return asSortedHosts(preparer.prepare(application, cluster, nodeSpec, groups), resources);
}
@Override
public void activate(Collection<HostSpec> hosts, ActivationContext context, ApplicationTransaction transaction) {
validate(hosts);
activator.activate(hosts, context.generation(), transaction);
}
@Override
public void restart(ApplicationId application, HostFilter filter) {
nodeRepository.nodes().restartActive(ApplicationFilter.from(application).and(NodeHostFilter.from(filter)));
}
@Override
public void remove(ApplicationTransaction transaction) {
nodeRepository.remove(transaction);
loadBalancerProvisioner.ifPresent(lbProvisioner -> lbProvisioner.deactivate(transaction));
}
@Override
public ProvisionLock lock(ApplicationId application) {
return new ProvisionLock(application, nodeRepository.nodes().lock(application));
}
/**
* Returns the target cluster resources, a value between the min and max in the requested capacity,
* and updates the application store with the received min and max.
*/
private ClusterResources decideTargetResources(ApplicationId applicationId, ClusterSpec clusterSpec, Capacity requested) {
try (Mutex lock = nodeRepository.nodes().lock(applicationId)) {
var application = nodeRepository.applications().get(applicationId).orElse(Application.empty(applicationId))
.withCluster(clusterSpec.id(), clusterSpec.isExclusive(), requested);
nodeRepository.applications().put(application, lock);
var cluster = application.cluster(clusterSpec.id()).get();
return cluster.targetResources().orElseGet(() -> currentResources(application, clusterSpec, cluster, requested));
}
}
/** Returns the current resources of this cluster, or requested min if none */
private ClusterResources currentResources(Application application,
ClusterSpec clusterSpec,
Cluster cluster,
Capacity requested) {
NodeList nodes = nodeRepository.nodes().list(Node.State.active).owner(application.id())
.cluster(clusterSpec.id())
.not().retired()
.not().removable();
boolean firstDeployment = nodes.isEmpty();
AllocatableClusterResources currentResources =
firstDeployment // start at min, preserve current resources otherwise
? new AllocatableClusterResources(requested.minResources(), clusterSpec, nodeRepository)
: new AllocatableClusterResources(nodes.asList(), nodeRepository);
var clusterModel = new ClusterModel(application, cluster, clusterSpec, nodes, nodeRepository.metricsDb(), nodeRepository.clock());
return within(Limits.of(requested), currentResources, firstDeployment, clusterModel);
}
/** Make the minimal adjustments needed to the current resources to stay within the limits */
private ClusterResources within(Limits limits,
AllocatableClusterResources current,
boolean firstDeployment,
ClusterModel clusterModel) {
if (limits.min().equals(limits.max())) return limits.min();
// Don't change current deployments that are still legal
var currentAsAdvertised = current.advertisedResources();
if (! firstDeployment && currentAsAdvertised.isWithin(limits.min(), limits.max())) return currentAsAdvertised;
// Otherwise, find an allocation that preserves the current resources as well as possible
return allocationOptimizer.findBestAllocation(ResourceTarget.preserve(current),
current,
clusterModel,
limits)
.orElseThrow(() -> newNoAllocationPossible(current.clusterSpec(), limits))
.advertisedResources();
}
private void logIfDownscaled(int targetNodes, int actualNodes, ClusterSpec cluster, ProvisionLogger logger) {
if (zone.environment().isManuallyDeployed() && actualNodes < targetNodes)
logger.log(Level.INFO, "Requested " + targetNodes + " nodes for " + cluster +
", downscaling to " + actualNodes + " nodes in " + zone.environment());
}
private List<HostSpec> asSortedHosts(List<Node> nodes, NodeResources requestedResources) {
nodes.sort(Comparator.comparingInt(node -> node.allocation().get().membership().index()));
List<HostSpec> hosts = new ArrayList<>(nodes.size());
for (Node node : nodes) {
log.log(Level.FINE, () -> "Prepared node " + node.hostname() + " - " + node.flavor());
Allocation nodeAllocation = node.allocation().orElseThrow(IllegalStateException::new);
hosts.add(new HostSpec(node.hostname(),
nodeRepository.resourcesCalculator().realResourcesOf(node, nodeRepository),
node.flavor().resources(),
requestedResources,
nodeAllocation.membership(),
node.status().vespaVersion(),
nodeAllocation.networkPorts(),
node.status().containerImage()));
if (nodeAllocation.networkPorts().isPresent()) {
log.log(Level.FINE, () -> "Prepared node " + node.hostname() + " has port allocations");
}
}
return hosts;
}
private void validate(Collection<HostSpec> hosts) {
for (HostSpec host : hosts) {
if (host.membership().isEmpty())
throw new IllegalArgumentException("Hosts must be assigned a cluster when activating, but got " + host);
if (host.membership().get().cluster().group().isEmpty())
throw new IllegalArgumentException("Hosts must be assigned a group when activating, but got " + host);
}
}
private IllegalArgumentException newNoAllocationPossible(ClusterSpec spec, Limits limits) {
StringBuilder message = new StringBuilder("No allocation possible within ").append(limits);
boolean exclusiveHosts = spec.isExclusive() || nodeRepository.zone().getCloud().dynamicProvisioning();
if (exclusiveHosts)
message.append(". Nearest allowed node resources: ").append(findNearestNodeResources(limits));
return new IllegalArgumentException(message.toString());
}
private NodeResources findNearestNodeResources(Limits limits) {
NodeResources nearestMin = nearestFlavorResources(limits.min().nodeResources());
NodeResources nearestMax = nearestFlavorResources(limits.max().nodeResources());
if (limits.min().nodeResources().distanceTo(nearestMin) < limits.max().nodeResources().distanceTo(nearestMax))
return nearestMin;
else
return nearestMax;
}
/** Returns the advertised flavor resources which are nearest to the given resources */
private NodeResources nearestFlavorResources(NodeResources requestedResources) {
NodeResources nearestHostResources = nodeRepository.flavors().getFlavors().stream()
.map(flavor -> nodeRepository.resourcesCalculator().advertisedResourcesOf(flavor))
.filter(resources -> resources.diskSpeed().compatibleWith(requestedResources.diskSpeed()))
.filter(resources -> resources.storageType().compatibleWith(requestedResources.storageType()))
.min(Comparator.comparingDouble(resources -> resources.distanceTo(requestedResources)))
.orElseThrow()
.withBandwidthGbps(requestedResources.bandwidthGbps());
if ( nearestHostResources.storageType() == NodeResources.StorageType.remote)
nearestHostResources = nearestHostResources.withDiskGb(requestedResources.diskGb());
return nearestHostResources;
}
}
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