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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.model.builder.xml.dom;
import com.yahoo.component.Version;
import com.yahoo.config.model.api.ConfigServerSpec;
import com.yahoo.config.provision.ClusterSpec;
import com.yahoo.vespa.model.HostResource;
import com.yahoo.vespa.model.HostSystem;
import com.yahoo.vespa.model.admin.*;
import com.yahoo.config.model.ConfigModelContext;
import com.yahoo.vespa.model.admin.Admin;
import com.yahoo.vespa.model.container.Container;
import com.yahoo.vespa.model.container.ContainerModel;
import org.w3c.dom.Element;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.List;
import java.util.Optional;
import java.util.stream.Collectors;
/**
* Builds the admin model from a version 4 XML tag, or as a default when an admin 3 tag or no admin tag is used.
*
* @author bratseth
*/
public class DomAdminV4Builder extends DomAdminBuilderBase {
private final Collection<ContainerModel> containerModels;
private final ConfigModelContext context;
public DomAdminV4Builder(ConfigModelContext context, boolean multitenant, List<ConfigServerSpec> configServerSpecs,
Collection<ContainerModel> containerModels) {
super(context.getApplicationType(), context.getDeployState().getFileRegistry(), multitenant,
configServerSpecs);
this.containerModels = containerModels;
this.context = context;
}
@Override
protected void doBuildAdmin(Admin admin, Element w3cAdminElement) {
ModelElement adminElement = new ModelElement(w3cAdminElement);
admin.addConfigservers(getConfigServersFromSpec(admin));
Version version = context.getDeployState().getWantedNodeVespaVersion();
// Note: These two elements only exists in admin version 4.0
// This build handles admin version 3.0 by ignoring its content (as the content is not useful)
Optional<NodesSpecification> requestedSlobroks =
NodesSpecification.optionalDedicatedFromParent(adminElement.getChild("slobroks"), version);
Optional<NodesSpecification> requestedLogservers =
NodesSpecification.optionalDedicatedFromParent(adminElement.getChild("logservers"), version);
assignSlobroks(requestedSlobroks.orElse(NodesSpecification.nonDedicated(3, version)), admin);
assignLogserver(requestedLogservers.orElse(NodesSpecification.nonDedicated(1, version)), admin);
addLogForwarders(adminElement.getChild("logforwarding"), admin);
}
private void assignSlobroks(NodesSpecification nodesSpecification, Admin admin) {
if (nodesSpecification.isDedicated()) {
createSlobroks(admin, allocateHosts(admin.getHostSystem(), "slobroks", nodesSpecification));
}
else {
createSlobroks(admin, pickContainerHosts(nodesSpecification.count(), 2));
}
}
private void assignLogserver(NodesSpecification nodesSpecification, Admin admin) {
if (nodesSpecification.count() > 1) throw new IllegalArgumentException("You can only request a single log server");
if (nodesSpecification.isDedicated()) {
createLogserver(admin, allocateHosts(admin.getHostSystem(), "logserver", nodesSpecification));
}
else {
if (containerModels.iterator().hasNext())
createLogserver(admin, sortedContainerHostsFrom(containerModels.iterator().next(), nodesSpecification.count(), false));
}
}
private Collection<HostResource> allocateHosts(HostSystem hostSystem, String clusterId, NodesSpecification nodesSpecification) {
return nodesSpecification.provision(hostSystem,
ClusterSpec.Type.admin,
ClusterSpec.Id.from(clusterId),
context.getDeployLogger()).keySet();
}
/**
* Returns a list of container hosts to use for an auxiliary cluster.
* The list returns the same nodes on each invocation given the same available nodes.
*
* @param count the desired number of nodes. More nodes may be returned to ensure a smooth transition
* on topology changes, and less nodes may be returned if fewer are available
* @param minHostsPerContainerCluster the desired number of hosts per cluster
*/
private List<HostResource> pickContainerHosts(int count, int minHostsPerContainerCluster) {
// Pick from all container clusters to make sure we don't lose all nodes at once if some clusters are removed.
// This will overshoot the desired size (due to ceil and picking at least one node per cluster).
List<HostResource> picked = new ArrayList<>();
for (ContainerModel containerModel : containerModels)
picked.addAll(pickContainerHostsFrom(containerModel,
(int) Math.max(minHostsPerContainerCluster,
Math.ceil((double) count / containerModels.size()))));
return picked;
}
private List<HostResource> pickContainerHostsFrom(ContainerModel model, int count) {
boolean retired = true;
List<HostResource> picked = sortedContainerHostsFrom(model, count, !retired);
// if we can return multiple hosts, include retired nodes which would have been picked before
// (probably - assuming all previous nodes were retired, which is always true for a single cluster
// at the moment (Sept 2015)) to ensure a smoother transition between the old and new topology
// by including both new and old nodes during the retirement period
picked.addAll(sortedContainerHostsFrom(model, count, retired));
return picked;
}
/** Returns the count first containers in the current model having isRetired set to the given value */
private List<HostResource> sortedContainerHostsFrom(ContainerModel model, int count, boolean retired) {
List<HostResource> hosts = model.getCluster().getContainers().stream()
.filter(container -> retired == container.isRetired())
.map(Container::getHostResource)
.collect(Collectors.toList());
return HostResource.pickHosts(hosts, count, 1);
}
private void createLogserver(Admin admin, Collection<HostResource> hosts) {
if (hosts.isEmpty()) return; // No log server can be created (and none is needed)
Logserver logserver = new Logserver(admin);
logserver.setHostResource(hosts.iterator().next());
admin.setLogserver(logserver);
logserver.initService();
}
private void createSlobroks(Admin admin, Collection<HostResource> hosts) {
if (hosts.isEmpty()) return; // No slobroks can be created (and none are needed)
List<Slobrok> slobroks = new ArrayList<>();
int index = 0;
for (HostResource host : hosts) {
Slobrok slobrok = new Slobrok(admin, index++);
slobrok.setHostResource(host);
slobroks.add(slobrok);
slobrok.initService();
}
admin.addSlobroks(slobroks);
}
}
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