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// Copyright 2019 Oath Inc. 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.component.Version;
import com.yahoo.config.provision.ApplicationId;
import com.yahoo.config.provision.NodeResources;
import com.yahoo.config.provision.NodeType;
import com.yahoo.config.provision.OutOfCapacityException;
import com.yahoo.transaction.Mutex;
import com.yahoo.vespa.flags.FlagSource;
import com.yahoo.vespa.flags.Flags;
import com.yahoo.vespa.flags.ListFlag;
import com.yahoo.vespa.flags.custom.PreprovisionCapacity;
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.provisioning.FatalProvisioningException;
import com.yahoo.vespa.hosted.provision.provisioning.HostProvisioner;
import com.yahoo.vespa.hosted.provision.provisioning.NodeResourceComparator;
import com.yahoo.vespa.hosted.provision.provisioning.ProvisionedHost;
import com.yahoo.yolean.Exceptions;
import java.time.Duration;
import java.util.Collection;
import java.util.Comparator;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.function.Function;
import java.util.logging.Level;
import java.util.logging.Logger;
import java.util.stream.Collectors;
import java.util.stream.IntStream;
/**
* @author freva
*/
public class DynamicProvisioningMaintainer extends NodeRepositoryMaintainer {
private static final Logger log = Logger.getLogger(DynamicProvisioningMaintainer.class.getName());
private static final ApplicationId preprovisionAppId = ApplicationId.from("hosted-vespa", "tenant-host", "preprovision");
private final HostProvisioner hostProvisioner;
private final ListFlag<PreprovisionCapacity> preprovisionCapacityFlag;
DynamicProvisioningMaintainer(NodeRepository nodeRepository,
Duration interval,
HostProvisioner hostProvisioner,
FlagSource flagSource) {
super(nodeRepository, interval);
this.hostProvisioner = hostProvisioner;
this.preprovisionCapacityFlag = Flags.PREPROVISION_CAPACITY.bindTo(flagSource);
}
@Override
protected void maintain() {
if (! nodeRepository().zone().getCloud().dynamicProvisioning()) return;
try (Mutex lock = nodeRepository().lockUnallocated()) {
NodeList nodes = nodeRepository().list();
updateProvisioningNodes(nodes, lock);
convergeToCapacity(nodes);
}
}
void updateProvisioningNodes(NodeList nodes, Mutex lock) {
Map<String, Set<Node>> nodesByProvisionedParentHostname = nodes.nodeType(NodeType.tenant).asList().stream()
.filter(node -> node.parentHostname().isPresent())
.collect(Collectors.groupingBy(
node -> node.parentHostname().get(),
Collectors.toSet()));
nodes.state(Node.State.provisioned).nodeType(NodeType.host).forEach(host -> {
Set<Node> children = nodesByProvisionedParentHostname.getOrDefault(host.hostname(), Set.of());
try {
List<Node> updatedNodes = hostProvisioner.provision(host, children);
nodeRepository().write(updatedNodes, lock);
} catch (IllegalArgumentException | IllegalStateException e) {
log.log(Level.INFO, "Failed to provision " + host.hostname() + " with " + children.size() + " children: " +
Exceptions.toMessageString(e));
} catch (FatalProvisioningException e) {
log.log(Level.SEVERE, "Failed to provision " + host.hostname() + " with " + children.size() +
" children, failing out the host recursively", e);
// Fail out as operator to force a quick redeployment
nodeRepository().failRecursively(
host.hostname(), Agent.operator, "Failed by HostProvisioner due to provisioning failure");
} catch (RuntimeException e) {
log.log(Level.WARNING, "Failed to provision " + host.hostname() + ", will retry in " + interval(), e);
}
});
}
void convergeToCapacity(NodeList nodes) {
Collection<Node> removableHosts = getRemovableHosts(nodes);
List<NodeResources> preProvisionCapacity = preprovisionCapacityFlag.value().stream()
.flatMap(cap -> {
NodeResources resources = new NodeResources(cap.getVcpu(), cap.getMemoryGb(), cap.getDiskGb(), 1);
return IntStream.range(0, cap.getCount()).mapToObj(i -> resources);
})
.sorted(NodeResourceComparator.memoryDiskCpuOrder().reversed())
.collect(Collectors.toList());
for (Iterator<NodeResources> it = preProvisionCapacity.iterator(); it.hasNext() && !removableHosts.isEmpty();) {
NodeResources resources = it.next();
removableHosts.stream()
.filter(nodeRepository()::canAllocateTenantNodeTo)
.filter(host -> nodeRepository().resourcesCalculator().advertisedResourcesOf(host.flavor()).satisfies(resources))
.min(Comparator.comparingInt(n -> n.flavor().cost()))
.ifPresent(host -> {
removableHosts.remove(host);
it.remove();
});
}
// pre-provisioning is best effort, do one host at a time
preProvisionCapacity.forEach(resources -> {
try {
Version osVersion = nodeRepository().osVersions().targetFor(NodeType.host).orElse(Version.emptyVersion);
List<Node> hosts = hostProvisioner.provisionHosts(nodeRepository().database().getProvisionIndexes(1),
resources, preprovisionAppId, osVersion)
.stream()
.map(ProvisionedHost::generateHost)
.collect(Collectors.toList());
nodeRepository().addNodes(hosts, Agent.DynamicProvisioningMaintainer);
} catch (OutOfCapacityException | IllegalArgumentException | IllegalStateException e) {
log.log(Level.WARNING, "Failed to pre-provision " + resources + ":" + e.getMessage());
} catch (RuntimeException e) {
log.log(Level.WARNING, "Failed to pre-provision " + resources + ", will retry in " + interval(), e);
}
});
// Finally, deprovision excess hosts.
removableHosts.forEach(host -> {
try {
hostProvisioner.deprovision(host);
nodeRepository().removeRecursively(host, true);
} catch (RuntimeException e) {
log.log(Level.WARNING, "Failed to deprovision " + host.hostname() + ", will retry in " + interval(), e);
}
});
}
private static Collection<Node> getRemovableHosts(NodeList nodes) {
Map<String, Node> hostsByHostname = nodes.nodeType(NodeType.host)
.asList().stream()
.filter(host -> host.state() != Node.State.parked || host.status().wantToDeprovision())
.collect(Collectors.toMap(Node::hostname, Function.identity()));
nodes.asList().stream()
.filter(node -> node.allocation().isPresent())
.flatMap(node -> node.parentHostname().stream())
.distinct()
.forEach(hostsByHostname::remove);
return hostsByHostname.values();
}
}
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