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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.config.model.provision;
import com.yahoo.collections.ListMap;
import com.yahoo.collections.Pair;
import com.yahoo.config.model.api.HostProvisioner;
import com.yahoo.config.provision.Capacity;
import com.yahoo.config.provision.ClusterMembership;
import com.yahoo.config.provision.ClusterSpec;
import com.yahoo.config.provision.HostSpec;
import com.yahoo.config.provision.ProvisionLogger;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.ListIterator;
import java.util.Map;
import java.util.Optional;
import java.util.Set;
/**
* In memory host provisioner for testing only.
* NB! ATM cannot be reused after allocate has been called.
*
* @author hmusum
* @author bratseth
*/
public class InMemoryProvisioner implements HostProvisioner {
/**
* If this is true an exception is thrown when all nodes are used.
* If false this will simply return nodes best effort, preferring to satisfy the
* number of groups requested when possible.
*/
private final boolean failOnOutOfCapacity;
/** Hosts which should be returned as retired */
private final Set<String> retiredHostNames;
/** Free hosts of each flavor */
private final ListMap<String, Host> freeNodes = new ListMap<>();
private final Map<String, HostSpec> legacyMapping = new LinkedHashMap<>();
private final Map<ClusterSpec, List<HostSpec>> allocations = new LinkedHashMap<>();
/** Indexes must be unique across all groups in a cluster */
private final Map<Pair<ClusterSpec.Type,ClusterSpec.Id>, Integer> nextIndexInCluster = new HashMap<>();
/** Use this index as start index for all clusters */
private final int startIndexForClusters;
/** Creates this with a number of nodes of the flavor 'default' */
public InMemoryProvisioner(int nodeCount) {
this(Collections.singletonMap("default", createHostInstances(nodeCount)), true, 0);
}
/** Creates this with a set of host names of the flavor 'default' */
public InMemoryProvisioner(boolean failOnOutOfCapacity, String... hosts) {
this(Collections.singletonMap("default", toHostInstances(hosts)), failOnOutOfCapacity, 0);
}
/** Creates this with a set of hosts of the flavor 'default' */
public InMemoryProvisioner(Hosts hosts, boolean failOnOutOfCapacity, String ... retiredHostNames) {
this(Collections.singletonMap("default", hosts.asCollection()), failOnOutOfCapacity, 0, retiredHostNames);
}
/** Creates this with a set of hosts of the flavor 'default' */
public InMemoryProvisioner(Hosts hosts, boolean failOnOutOfCapacity, int startIndexForClusters, String ... retiredHostNames) {
this(Collections.singletonMap("default", hosts.asCollection()), failOnOutOfCapacity, startIndexForClusters, retiredHostNames);
}
public InMemoryProvisioner(Map<String, Collection<Host>> hosts, boolean failOnOutOfCapacity, int startIndexForClusters, String ... retiredHostNames) {
this.failOnOutOfCapacity = failOnOutOfCapacity;
for (Map.Entry<String, Collection<Host>> hostsOfFlavor : hosts.entrySet())
for (Host host : hostsOfFlavor.getValue())
freeNodes.put(hostsOfFlavor.getKey(), host);
this.retiredHostNames = new HashSet<>(Arrays.asList(retiredHostNames));
this.startIndexForClusters = startIndexForClusters;
}
private static Collection<Host> toHostInstances(String[] hostnames) {
List<Host> hosts = new ArrayList<>();
for (String hostname : hostnames) {
hosts.add(new Host(hostname));
}
return hosts;
}
private static Collection<Host> createHostInstances(int hostCount) {
List<Host> hosts = new ArrayList<>();
for (int i = 1; i <= hostCount; i++) {
hosts.add(new Host("host" + i));
}
return hosts;
}
/** Returns the current allocations of this as a mutable map */
public Map<ClusterSpec, List<HostSpec>> allocations() { return allocations; }
@Override
public HostSpec allocateHost(String alias) {
if (legacyMapping.containsKey(alias)) return legacyMapping.get(alias);
List<Host> defaultHosts = freeNodes.get("default");
if (defaultHosts.isEmpty()) throw new IllegalArgumentException("No more hosts of default flavor available");
Host newHost = freeNodes.removeValue("default", 0);
HostSpec hostSpec = new HostSpec(newHost.hostname(), newHost.aliases(), newHost.flavor(), Optional.empty(), newHost.version());
legacyMapping.put(alias, hostSpec);
return hostSpec;
}
@Override
public List<HostSpec> prepare(ClusterSpec cluster, Capacity requestedCapacity, int groups, ProvisionLogger logger) {
if (cluster.group().isPresent() && groups > 1)
throw new IllegalArgumentException("Cannot both be specifying a group and ask for groups to be created");
if (requestedCapacity.nodeCount() % groups != 0)
throw new IllegalArgumentException("Requested " + requestedCapacity.nodeCount() + " nodes in " +
groups + " groups, but the node count is not divisible into this number of groups");
int capacity = failOnOutOfCapacity || requestedCapacity.isRequired()
? requestedCapacity.nodeCount()
: Math.min(requestedCapacity.nodeCount(), freeNodes.get("default").size() + totalAllocatedTo(cluster));
if (groups > capacity)
groups = capacity;
String flavor = requestedCapacity.flavor().orElse("default");
List<HostSpec> allocation = new ArrayList<>();
if (groups == 1) {
allocation.addAll(allocateHostGroup(cluster.with(Optional.of(ClusterSpec.Group.from(0))),
flavor,
capacity,
startIndexForClusters,
requestedCapacity.canFail()));
}
else {
for (int i = 0; i < groups; i++) {
allocation.addAll(allocateHostGroup(cluster.with(Optional.of(ClusterSpec.Group.from(i))),
flavor,
capacity / groups,
allocation.size(),
requestedCapacity.canFail()));
}
}
for (ListIterator<HostSpec> i = allocation.listIterator(); i.hasNext(); ) {
HostSpec host = i.next();
if (retiredHostNames.contains(host.hostname()))
i.set(retire(host));
}
return allocation;
}
private HostSpec retire(HostSpec host) {
return new HostSpec(host.hostname(),
host.aliases(),
host.flavor(),
Optional.of(host.membership().get().retire()),
host.version());
}
private List<HostSpec> allocateHostGroup(ClusterSpec clusterGroup, String flavor, int nodesInGroup, int startIndex, boolean canFail) {
List<HostSpec> allocation = allocations.getOrDefault(clusterGroup, new ArrayList<>());
allocations.put(clusterGroup, allocation);
int nextIndex = nextIndexInCluster.getOrDefault(new Pair<>(clusterGroup.type(), clusterGroup.id()), startIndex);
while (allocation.size() < nodesInGroup) {
if (freeNodes.get(flavor).isEmpty()) {
if (canFail)
throw new IllegalArgumentException("Insufficient capacity of flavor '" + flavor + "'");
else
break;
}
Host newHost = freeNodes.removeValue(flavor, 0);
ClusterMembership membership = ClusterMembership.from(clusterGroup, nextIndex++);
allocation.add(new HostSpec(newHost.hostname(), newHost.aliases(), newHost.flavor(), Optional.of(membership), newHost.version()));
}
nextIndexInCluster.put(new Pair<>(clusterGroup.type(), clusterGroup.id()), nextIndex);
while (allocation.size() > nodesInGroup)
allocation.remove(0);
return allocation;
}
private int totalAllocatedTo(ClusterSpec cluster) {
int count = 0;
for (Map.Entry<ClusterSpec, List<HostSpec>> allocation : allocations.entrySet()) {
if ( ! allocation.getKey().type().equals(cluster.type())) continue;
if ( ! allocation.getKey().id().equals(cluster.id())) continue;
count += allocation.getValue().size();
}
return count;
}
}
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