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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.provisioning;
import com.yahoo.config.provision.ApplicationId;
import com.yahoo.config.provision.ApplicationTransaction;
import com.yahoo.config.provision.ClusterMembership;
import com.yahoo.config.provision.ClusterSpec;
import com.yahoo.config.provision.Flavor;
import com.yahoo.config.provision.HostSpec;
import com.yahoo.config.provision.ParentHostUnavailableException;
import com.yahoo.vespa.hosted.provision.Node;
import com.yahoo.vespa.hosted.provision.NodeList;
import com.yahoo.vespa.hosted.provision.NodeMutex;
import com.yahoo.vespa.hosted.provision.NodeRepository;
import com.yahoo.vespa.hosted.provision.applications.Application;
import com.yahoo.vespa.hosted.provision.applications.ScalingEvent;
import com.yahoo.vespa.hosted.provision.node.Agent;
import com.yahoo.vespa.hosted.provision.node.Allocation;
import java.time.Instant;
import java.util.ArrayList;
import java.util.Collection;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Optional;
import java.util.Set;
import java.util.stream.Collectors;
/**
* Performs activation of resources for an application. E.g. nodes or load balancers.
*
* @author bratseth
*/
class Activator {
private final NodeRepository nodeRepository;
private final Optional<LoadBalancerProvisioner> loadBalancerProvisioner;
public Activator(NodeRepository nodeRepository, Optional<LoadBalancerProvisioner> loadBalancerProvisioner) {
this.nodeRepository = nodeRepository;
this.loadBalancerProvisioner = loadBalancerProvisioner;
}
/** Activate required resources for application guarded by given lock */
public void activate(Collection<HostSpec> hosts, long generation, ApplicationTransaction transaction) {
NodeList newActive = activateNodes(hosts, generation, transaction);
activateLoadBalancers(hosts, newActive, transaction);
}
/**
* Add operations to activates nodes for an application to the given transaction.
* The operations are not effective until the transaction is committed.
* <p>
* Pre condition: The application has a possibly empty set of nodes in each of reserved and active.
* <p>
* Post condition: Nodes in reserved which are present in <code>hosts</code> are moved to active.
* Nodes in active which are not present in <code>hosts</code> are moved to inactive.
*
* @param hosts the hosts to make the set of active nodes of this
* @param generation the application config generation that is activated
* @param transaction transaction with operations to commit together with any operations done within the repository,
* while holding the node repository lock on this application
* @return the nodes that will be active when transaction is committed
*/
private NodeList activateNodes(Collection<HostSpec> hosts, long generation, ApplicationTransaction transaction) {
Instant activationTime = nodeRepository.clock().instant(); // Use one timestamp for all activation changes
ApplicationId application = transaction.application();
Set<String> hostnames = hosts.stream().map(HostSpec::hostname).collect(Collectors.toSet());
NodeList allNodes = nodeRepository.nodes().list();
NodeList applicationNodes = allNodes.owner(application);
NodeList reserved = applicationNodes.state(Node.State.reserved).matching(node -> hostnames.contains(node.hostname()));
reserved = updatePortsFrom(hosts, reserved);
nodeRepository.nodes().reserve(reserved.asList()); // Re-reserve nodes to avoid reservation expiry
NodeList oldActive = applicationNodes.state(Node.State.active); // All nodes active now
NodeList continuedActive = oldActive.matching(node -> hostnames.contains(node.hostname()));
NodeList newActive = withHostInfo(continuedActive, hosts, activationTime).and(reserved); // All nodes that will be active when this is committed
if ( ! containsAll(hostnames, newActive))
throw new RuntimeException("Activation of " + application + " failed, could not find all requested hosts." +
"\nRequested: " + hosts +
"\nReserved: " + reserved.hostnames() +
"\nActive: " + oldActive.hostnames());
validateParentHosts(application, allNodes, reserved);
NodeList activeToRemove = oldActive.matching(node -> ! hostnames.contains(node.hostname()));
remove(activeToRemove, transaction); // TODO: Pass activation time in this call and next line
nodeRepository.nodes().activate(newActive.asList(), transaction); // activate also continued active to update node state
rememberResourceChange(transaction, generation, activationTime,
oldActive.not().retired(),
newActive.not().retired());
unreserveParentsOf(reserved);
return newActive;
}
private void remove(NodeList nodes, ApplicationTransaction transaction) {
nodes = NodeList.copyOf(nodes.mapToList(Node::unretire)); // clear retire flag when moving to non-active state
nodeRepository.nodes().deactivate(nodes.not().failing().asList(), transaction);
nodeRepository.nodes().fail(nodes.failing().asList(), transaction);
}
private void rememberResourceChange(ApplicationTransaction transaction, long generation, Instant at,
NodeList oldNodes, NodeList newNodes) {
Optional<Application> application = nodeRepository.applications().get(transaction.application());
if (application.isEmpty()) return; // infrastructure app, hopefully :-|
Map<ClusterSpec.Id, NodeList> currentNodesByCluster = newNodes.groupingBy(node -> node.allocation().get().membership().cluster().id());
Application modified = application.get();
for (var clusterEntry : currentNodesByCluster.entrySet()) {
var cluster = modified.cluster(clusterEntry.getKey()).get();
var previousResources = oldNodes.cluster(clusterEntry.getKey()).toResources();
var currentResources = clusterEntry.getValue().toResources();
if ( previousResources.nodeResources().isUnspecified()
|| ! previousResources.justNumbers().equals(currentResources.justNumbers())) {
cluster = cluster.with(ScalingEvent.create(previousResources, currentResources, generation, at));
}
if (cluster.target().resources().isPresent()
&& cluster.target().resources().get().justNumbers().equals(currentResources.justNumbers())) {
cluster = cluster.withTarget(cluster.target().asIdeal(nodeRepository.clock().instant()));
}
if (cluster != modified.cluster(clusterEntry.getKey()).get())
modified = modified.with(cluster);
}
if (modified != application.get())
nodeRepository.applications().put(modified, transaction);
}
/** When a tenant node is activated on a host, we can open up that host for use by others */
private void unreserveParentsOf(NodeList nodes) {
for (Node node : nodes) {
if ( node.parentHostname().isEmpty()) continue;
Optional<Node> parentNode = nodeRepository.nodes().node(node.parentHostname().get());
if (parentNode.isEmpty()) continue;
if (parentNode.get().reservedTo().isEmpty()) continue;
// Above is an optimization to avoid unnecessary locking - now repeat all conditions under lock
Optional<NodeMutex> parent = nodeRepository.nodes().lockAndGet(node.parentHostname().get());
if (parent.isEmpty()) continue;
try (var lock = parent.get()) {
if (lock.node().reservedTo().isEmpty()) continue;
nodeRepository.nodes().write(lock.node().withoutReservedTo(), lock);
}
}
}
/** Activate load balancers */
private void activateLoadBalancers(Collection<HostSpec> hosts, NodeList newActive, ApplicationTransaction transaction) {
loadBalancerProvisioner.ifPresent(provisioner -> provisioner.activate(allClustersOf(hosts), newActive, transaction));
}
private static Set<ClusterSpec> allClustersOf(Collection<HostSpec> hosts) {
return hosts.stream()
.map(HostSpec::membership)
.flatMap(Optional::stream)
.map(ClusterMembership::cluster)
.collect(Collectors.toUnmodifiableSet());
}
private static void validateParentHosts(ApplicationId application, NodeList allNodes, NodeList potentialChildren) {
Set<String> parentHostnames = potentialChildren.stream()
.map(Node::parentHostname)
.flatMap(Optional::stream)
.collect(Collectors.toSet());
Set<String> nonActiveHosts = allNodes.not().state(Node.State.active)
.matching(node -> parentHostnames.contains(node.hostname()))
.hostnames();
if (nonActiveHosts.size() > 0) {
long numActive = parentHostnames.size() - nonActiveHosts.size();
var messageBuilder = new StringBuilder()
.append(numActive).append("/").append(parentHostnames.size())
.append(" hosts for ")
.append(application)
.append(" have completed provisioning and bootstrapping, still waiting for ");
if (nonActiveHosts.size() <= 5) {
messageBuilder.append(nonActiveHosts.stream()
.sorted()
.collect(Collectors.joining(", ")));
} else {
messageBuilder.append(nonActiveHosts.stream()
.sorted()
.limit(3)
.collect(Collectors.joining(", ")))
.append(", and others");
}
var message = messageBuilder.toString();
throw new ParentHostUnavailableException(message);
}
}
private boolean containsAll(Set<String> hosts, NodeList nodes) {
Set<String> notFoundHosts = new HashSet<>(hosts);
for (Node node : nodes)
notFoundHosts.remove(node.hostname());
return notFoundHosts.isEmpty();
}
/** Returns the input nodes with the changes resulting from applying the settings in hosts to the given list of nodes. */
private NodeList withHostInfo(NodeList nodes, Collection<HostSpec> hosts, Instant at) {
List<Node> updated = new ArrayList<>();
for (Node node : nodes) {
HostSpec hostSpec = getHost(node.hostname(), hosts);
node = hostSpec.membership().get().retired() ? node.retire(at) : node.unretire();
if (! hostSpec.advertisedResources().equals(node.resources())) // A resized node
node = node.with(new Flavor(hostSpec.advertisedResources()), Agent.application, at);
Allocation allocation = node.allocation().get()
.with(hostSpec.membership().get())
.withRequestedResources(hostSpec.requestedResources()
.orElse(node.resources()));
if (hostSpec.networkPorts().isPresent())
allocation = allocation.withNetworkPorts(hostSpec.networkPorts().get());
node = node.with(allocation);
updated.add(node);
}
return NodeList.copyOf(updated);
}
/**
* Returns the input nodes with any port allocations from the hosts
*/
private NodeList updatePortsFrom(Collection<HostSpec> hosts, NodeList nodes) {
List<Node> updated = new ArrayList<>();
for (Node node : nodes) {
HostSpec hostSpec = getHost(node.hostname(), hosts);
Allocation allocation = node.allocation().get();
if (hostSpec.networkPorts().isPresent()) {
allocation = allocation.withNetworkPorts(hostSpec.networkPorts().get());
node = node.with(allocation);
}
updated.add(node);
}
return NodeList.copyOf(updated);
}
private HostSpec getHost(String hostname, Collection<HostSpec> fromHosts) {
for (HostSpec host : fromHosts)
if (host.hostname().equals(hostname))
return host;
return null;
}
}
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