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/*
* Licensed to Elasticsearch under one or more contributor
* license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright
* ownership. Elasticsearch licenses this file to you under
* the Apache License, Version 2.0 (the "License"); you may
* not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.elasticsearch.cluster;
import org.elasticsearch.cluster.action.index.MappingUpdatedAction;
import org.elasticsearch.cluster.action.index.NodeMappingRefreshAction;
import org.elasticsearch.cluster.action.shard.ShardStateAction;
import org.elasticsearch.cluster.metadata.IndexNameExpressionResolver;
import org.elasticsearch.cluster.metadata.IndexTemplateFilter;
import org.elasticsearch.cluster.metadata.MetaDataCreateIndexService;
import org.elasticsearch.cluster.metadata.MetaDataDeleteIndexService;
import org.elasticsearch.cluster.metadata.MetaDataIndexAliasesService;
import org.elasticsearch.cluster.metadata.MetaDataIndexStateService;
import org.elasticsearch.cluster.metadata.MetaDataIndexTemplateService;
import org.elasticsearch.cluster.metadata.MetaDataMappingService;
import org.elasticsearch.cluster.metadata.MetaDataUpdateSettingsService;
import org.elasticsearch.cluster.routing.DelayedAllocationService;
import org.elasticsearch.cluster.routing.RoutingService;
import org.elasticsearch.cluster.routing.allocation.AllocationService;
import org.elasticsearch.cluster.routing.allocation.allocator.BalancedShardsAllocator;
import org.elasticsearch.cluster.routing.allocation.allocator.ShardsAllocator;
import org.elasticsearch.cluster.routing.allocation.decider.AllocationDecider;
import org.elasticsearch.cluster.routing.allocation.decider.AllocationDeciders;
import org.elasticsearch.cluster.routing.allocation.decider.AwarenessAllocationDecider;
import org.elasticsearch.cluster.routing.allocation.decider.ClusterRebalanceAllocationDecider;
import org.elasticsearch.cluster.routing.allocation.decider.ConcurrentRebalanceAllocationDecider;
import org.elasticsearch.cluster.routing.allocation.decider.DiskThresholdDecider;
import org.elasticsearch.cluster.routing.allocation.decider.EnableAllocationDecider;
import org.elasticsearch.cluster.routing.allocation.decider.FilterAllocationDecider;
import org.elasticsearch.cluster.routing.allocation.decider.NodeVersionAllocationDecider;
import org.elasticsearch.cluster.routing.allocation.decider.RebalanceOnlyWhenActiveAllocationDecider;
import org.elasticsearch.cluster.routing.allocation.decider.ReplicaAfterPrimaryActiveAllocationDecider;
import org.elasticsearch.cluster.routing.allocation.decider.MaxRetryAllocationDecider;
import org.elasticsearch.cluster.routing.allocation.decider.SameShardAllocationDecider;
import org.elasticsearch.cluster.routing.allocation.decider.ShardsLimitAllocationDecider;
import org.elasticsearch.cluster.routing.allocation.decider.SnapshotInProgressAllocationDecider;
import org.elasticsearch.cluster.routing.allocation.decider.ThrottlingAllocationDecider;
import org.elasticsearch.cluster.service.ClusterService;
import org.elasticsearch.common.inject.AbstractModule;
import org.elasticsearch.common.logging.ESLogger;
import org.elasticsearch.common.logging.Loggers;
import org.elasticsearch.common.settings.ClusterSettings;
import org.elasticsearch.common.settings.Setting;
import org.elasticsearch.common.settings.Setting.Property;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.common.util.ExtensionPoint;
import org.elasticsearch.gateway.GatewayAllocator;
import org.elasticsearch.plugins.ClusterPlugin;
import org.elasticsearch.tasks.TaskResultsService;
import java.util.Collection;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.function.Function;
/**
* Configures classes and services that affect the entire cluster.
*/
public class ClusterModule extends AbstractModule {
public static final String EVEN_SHARD_COUNT_ALLOCATOR = "even_shard";
public static final String BALANCED_ALLOCATOR = "balanced"; // default
public static final Setting<String> SHARDS_ALLOCATOR_TYPE_SETTING =
new Setting<>("cluster.routing.allocation.type", BALANCED_ALLOCATOR, Function.identity(), Property.NodeScope);
private final Settings settings;
private final ExtensionPoint.SelectedType<ShardsAllocator> shardsAllocators = new ExtensionPoint.SelectedType<>("shards_allocator", ShardsAllocator.class);
private final ExtensionPoint.ClassSet<IndexTemplateFilter> indexTemplateFilters = new ExtensionPoint.ClassSet<>("index_template_filter", IndexTemplateFilter.class);
private final ClusterService clusterService;
private final IndexNameExpressionResolver indexNameExpressionResolver;
// pkg private for tests
final Collection<AllocationDecider> allocationDeciders;
// pkg private so tests can mock
Class<? extends ClusterInfoService> clusterInfoServiceImpl = InternalClusterInfoService.class;
public ClusterModule(Settings settings, ClusterService clusterService, List<ClusterPlugin> clusterPlugins) {
this.settings = settings;
this.allocationDeciders = createAllocationDeciders(settings, clusterService.getClusterSettings(), clusterPlugins);
registerShardsAllocator(ClusterModule.BALANCED_ALLOCATOR, BalancedShardsAllocator.class);
registerShardsAllocator(ClusterModule.EVEN_SHARD_COUNT_ALLOCATOR, BalancedShardsAllocator.class);
this.clusterService = clusterService;
indexNameExpressionResolver = new IndexNameExpressionResolver(settings);
}
public void registerShardsAllocator(String name, Class<? extends ShardsAllocator> clazz) {
shardsAllocators.registerExtension(name, clazz);
}
public void registerIndexTemplateFilter(Class<? extends IndexTemplateFilter> indexTemplateFilter) {
indexTemplateFilters.registerExtension(indexTemplateFilter);
}
public IndexNameExpressionResolver getIndexNameExpressionResolver() {
return indexNameExpressionResolver;
}
// TODO: this is public so allocation benchmark can access the default deciders...can we do that in another way?
/** Return a new {@link AllocationDecider} instance with builtin deciders as well as those from plugins. */
public static Collection<AllocationDecider> createAllocationDeciders(Settings settings, ClusterSettings clusterSettings,
List<ClusterPlugin> clusterPlugins) {
// collect deciders by class so that we can detect duplicates
Map<Class, AllocationDecider> deciders = new HashMap<>();
addAllocationDecider(deciders, new MaxRetryAllocationDecider(settings));
addAllocationDecider(deciders, new SameShardAllocationDecider(settings));
addAllocationDecider(deciders, new FilterAllocationDecider(settings, clusterSettings));
addAllocationDecider(deciders, new ReplicaAfterPrimaryActiveAllocationDecider(settings));
addAllocationDecider(deciders, new ThrottlingAllocationDecider(settings, clusterSettings));
addAllocationDecider(deciders, new RebalanceOnlyWhenActiveAllocationDecider(settings));
addAllocationDecider(deciders, new ClusterRebalanceAllocationDecider(settings, clusterSettings));
addAllocationDecider(deciders, new ConcurrentRebalanceAllocationDecider(settings, clusterSettings));
addAllocationDecider(deciders, new EnableAllocationDecider(settings, clusterSettings));
addAllocationDecider(deciders, new AwarenessAllocationDecider(settings, clusterSettings));
addAllocationDecider(deciders, new ShardsLimitAllocationDecider(settings, clusterSettings));
addAllocationDecider(deciders, new NodeVersionAllocationDecider(settings));
addAllocationDecider(deciders, new DiskThresholdDecider(settings, clusterSettings));
addAllocationDecider(deciders, new SnapshotInProgressAllocationDecider(settings, clusterSettings));
clusterPlugins.stream()
.flatMap(p -> p.createAllocationDeciders(settings, clusterSettings).stream())
.forEach(d -> addAllocationDecider(deciders, d));
return deciders.values();
}
/** Add the given allocation decider to the given deciders collection, erroring if the class name is already used. */
private static void addAllocationDecider(Map<Class, AllocationDecider> deciders, AllocationDecider decider) {
if (deciders.put(decider.getClass(), decider) != null) {
throw new IllegalArgumentException("Cannot specify allocation decider [" + decider.getClass().getName() + "] twice");
}
}
@Override
protected void configure() {
// bind ShardsAllocator
String shardsAllocatorType = shardsAllocators.bindType(binder(), settings, ClusterModule.SHARDS_ALLOCATOR_TYPE_SETTING.getKey(), ClusterModule.BALANCED_ALLOCATOR);
if (shardsAllocatorType.equals(ClusterModule.EVEN_SHARD_COUNT_ALLOCATOR)) {
final ESLogger logger = Loggers.getLogger(getClass(), settings);
logger.warn("{} allocator has been removed in 2.0 using {} instead", ClusterModule.EVEN_SHARD_COUNT_ALLOCATOR, ClusterModule.BALANCED_ALLOCATOR);
}
indexTemplateFilters.bind(binder());
bind(ClusterInfoService.class).to(clusterInfoServiceImpl).asEagerSingleton();
bind(GatewayAllocator.class).asEagerSingleton();
bind(AllocationService.class).asEagerSingleton();
bind(ClusterService.class).toInstance(clusterService);
bind(NodeConnectionsService.class).asEagerSingleton();
bind(MetaDataCreateIndexService.class).asEagerSingleton();
bind(MetaDataDeleteIndexService.class).asEagerSingleton();
bind(MetaDataIndexStateService.class).asEagerSingleton();
bind(MetaDataMappingService.class).asEagerSingleton();
bind(MetaDataIndexAliasesService.class).asEagerSingleton();
bind(MetaDataUpdateSettingsService.class).asEagerSingleton();
bind(MetaDataIndexTemplateService.class).asEagerSingleton();
bind(IndexNameExpressionResolver.class).toInstance(indexNameExpressionResolver);
bind(RoutingService.class).asEagerSingleton();
bind(DelayedAllocationService.class).asEagerSingleton();
bind(ShardStateAction.class).asEagerSingleton();
bind(NodeMappingRefreshAction.class).asEagerSingleton();
bind(MappingUpdatedAction.class).asEagerSingleton();
bind(TaskResultsService.class).asEagerSingleton();
bind(AllocationDeciders.class).toInstance(new AllocationDeciders(settings, allocationDeciders));
}
}
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