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// Copyright 2017 Yahoo Holdings. 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.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.transaction.Mutex;
import com.yahoo.transaction.NestedTransaction;
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.Allocation;
import java.util.ArrayList;
import java.util.Collection;
import java.util.HashSet;
import java.util.List;
import java.util.Optional;
import java.util.Set;
import java.util.logging.Logger;
import java.util.stream.Collectors;
/**
* Performs activation of resources for an application. E.g. nodes or load balancers.
*
* @author bratseth
*/
class Activator {
private static final Logger logger = Logger.getLogger(Activator.class.getName());
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 given application */
public void activate(ApplicationId application, Collection<HostSpec> hosts, NestedTransaction transaction) {
try (Mutex lock = nodeRepository.lock(application)) {
activateNodes(application, hosts, transaction, lock);
activateLoadBalancers(application, hosts, transaction, lock);
}
}
/**
* 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 transaction Transaction with operations to commit together with any operations done within the repository.
* @param application the application to allocate nodes for
* @param hosts the hosts to make the set of active nodes of this
* @param applicationLock application lock that must be held when calling this
*/
private void activateNodes(ApplicationId application, Collection<HostSpec> hosts, NestedTransaction transaction,
@SuppressWarnings("unused") Mutex applicationLock) {
Set<String> hostnames = hosts.stream().map(HostSpec::hostname).collect(Collectors.toSet());
NodeList allNodes = nodeRepository.list();
NodeList applicationNodes = allNodes.owner(application);
List<Node> reserved = applicationNodes.state(Node.State.reserved).asList();
List<Node> reservedToActivate = retainHostsInList(hostnames, reserved);
List<Node> active = applicationNodes.state(Node.State.active).asList();
List<Node> continuedActive = retainHostsInList(hostnames, active);
List<Node> allActive = new ArrayList<>(continuedActive);
allActive.addAll(reservedToActivate);
if (!containsAll(hostnames, allActive))
throw new IllegalArgumentException("Activation of " + application + " failed. " +
"Could not find all requested hosts." +
"\nRequested: " + hosts +
"\nReserved: " + toHostNames(reserved) +
"\nActive: " + toHostNames(active) +
"\nThis might happen if the time from reserving host to activation takes " +
"longer time than reservation expiry (the hosts will then no longer be reserved)");
validateParentHosts(application, allNodes, reservedToActivate);
List<Node> activeToRemove = removeHostsFromList(hostnames, active);
activeToRemove = activeToRemove.stream().map(Node::unretire).collect(Collectors.toList()); // only active nodes can be retired
nodeRepository.deactivate(activeToRemove, transaction);
nodeRepository.activate(updateFrom(hosts, continuedActive), transaction); // update active with any changes
nodeRepository.activate(updatePortsFrom(hosts, reservedToActivate), transaction);
unreserveParentsOf(reservedToActivate);
}
/** When a tenant node is activated on a host, we can open up that host for use by others */
private void unreserveParentsOf(List<Node> nodes) {
for (Node node : nodes) {
if ( node.parentHostname().isEmpty()) continue;
Optional<Node> parent = nodeRepository.getNode(node.parentHostname().get());
if (parent.isEmpty()) continue;
if (parent.get().reservedTo().isEmpty()) continue;
try (Mutex lock = nodeRepository.lock(parent.get())) {
Optional<Node> lockedParent = nodeRepository.getNode(parent.get().hostname());
if (lockedParent.isEmpty()) continue;
nodeRepository.write(lockedParent.get().withoutReservedTo(), lock);
}
}
}
/** Activate load balancers */
private void activateLoadBalancers(ApplicationId application, Collection<HostSpec> hosts, NestedTransaction transaction,
@SuppressWarnings("unused") Mutex applicationLock) {
loadBalancerProvisioner.ifPresent(provisioner -> provisioner.activate(application, clustersOf(hosts), applicationLock, transaction));
}
private static Set<ClusterSpec> clustersOf(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 nodes, List<Node> potentialChildren) {
Set<String> parentHostnames = potentialChildren.stream()
.map(Node::parentHostname)
.flatMap(Optional::stream)
.collect(Collectors.toSet());
Set<String> nonActiveHosts = nodes.asList().stream()
.filter(node -> parentHostnames.contains(node.hostname()))
.filter(node -> node.state() != Node.State.active)
.map(Node::hostname)
.collect(Collectors.toSet());
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 List<Node> retainHostsInList(Set<String> hosts, List<Node> nodes) {
return nodes.stream().filter(node -> hosts.contains(node.hostname())).collect(Collectors.toList());
}
private List<Node> removeHostsFromList(Set<String> hosts, List<Node> nodes) {
return nodes.stream().filter(node -> ! hosts.contains(node.hostname())).collect(Collectors.toList());
}
private Set<String> toHostNames(List<Node> nodes) {
return nodes.stream().map(Node::hostname).collect(Collectors.toSet());
}
private boolean containsAll(Set<String> hosts, List<Node> 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 List<Node> updateFrom(Collection<HostSpec> hosts, List<Node> nodes) {
List<Node> updated = new ArrayList<>();
for (Node node : nodes) {
HostSpec hostSpec = getHost(node.hostname(), hosts);
node = hostSpec.membership().get().retired() ? node.retire(nodeRepository.clock().instant()) : node.unretire();
if (! hostSpec.advertisedResources().equals(node.flavor().resources())) // A resized node
node = node.with(new Flavor(hostSpec.advertisedResources()));
Allocation allocation = node.allocation().get()
.with(hostSpec.membership().get())
.withRequestedResources(hostSpec.requestedResources()
.orElse(node.flavor().resources()));
if (hostSpec.networkPorts().isPresent())
allocation = allocation.withNetworkPorts(hostSpec.networkPorts().get());
node = node.with(allocation);
updated.add(node);
}
return updated;
}
/**
* Returns the input nodes with any port allocations from the hosts
*/
private List<Node> updatePortsFrom(Collection<HostSpec> hosts, List<Node> 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 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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