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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.action.search;
import org.elasticsearch.action.ActionListener;
import org.elasticsearch.action.support.ActionFilters;
import org.elasticsearch.action.support.HandledTransportAction;
import org.elasticsearch.cluster.ClusterState;
import org.elasticsearch.cluster.block.ClusterBlockLevel;
import org.elasticsearch.cluster.metadata.IndexNameExpressionResolver;
import org.elasticsearch.cluster.node.DiscoveryNode;
import org.elasticsearch.cluster.routing.GroupShardsIterator;
import org.elasticsearch.cluster.service.ClusterService;
import org.elasticsearch.common.inject.Inject;
import org.elasticsearch.common.settings.Setting;
import org.elasticsearch.common.settings.Setting.Property;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.index.Index;
import org.elasticsearch.search.SearchService;
import org.elasticsearch.search.builder.SearchSourceBuilder;
import org.elasticsearch.search.internal.AliasFilter;
import org.elasticsearch.tasks.Task;
import org.elasticsearch.threadpool.ThreadPool;
import org.elasticsearch.transport.TransportService;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.Executor;
import java.util.function.Function;
import static org.elasticsearch.action.search.SearchType.QUERY_AND_FETCH;
import static org.elasticsearch.action.search.SearchType.QUERY_THEN_FETCH;
public class TransportSearchAction extends HandledTransportAction<SearchRequest, SearchResponse> {
/** The maximum number of shards for a single search request. */
public static final Setting<Long> SHARD_COUNT_LIMIT_SETTING = Setting.longSetting(
"action.search.shard_count.limit", 1000L, 1L, Property.Dynamic, Property.NodeScope);
private final ClusterService clusterService;
private final SearchTransportService searchTransportService;
private final SearchPhaseController searchPhaseController;
private final SearchService searchService;
@Inject
public TransportSearchAction(Settings settings, ThreadPool threadPool, TransportService transportService, SearchService searchService,
SearchTransportService searchTransportService, SearchPhaseController searchPhaseController,
ClusterService clusterService, ActionFilters actionFilters,
IndexNameExpressionResolver indexNameExpressionResolver) {
super(settings, SearchAction.NAME, threadPool, transportService, actionFilters, indexNameExpressionResolver, SearchRequest::new);
this.searchPhaseController = searchPhaseController;
this.searchTransportService = searchTransportService;
SearchTransportService.registerRequestHandler(transportService, searchService);
this.clusterService = clusterService;
this.searchService = searchService;
}
private Map<String, AliasFilter> buildPerIndexAliasFilter(SearchRequest request, ClusterState clusterState, Index[] concreteIndices) {
final Map<String, AliasFilter> aliasFilterMap = new HashMap<>();
for (Index index : concreteIndices) {
clusterState.blocks().indexBlockedRaiseException(ClusterBlockLevel.READ, index.getName());
AliasFilter aliasFilter = searchService.buildAliasFilter(clusterState, index.getName(), request.indices());
assert aliasFilter != null;
aliasFilterMap.put(index.getUUID(), aliasFilter);
}
return aliasFilterMap;
}
private Map<String, Float> resolveIndexBoosts(SearchRequest searchRequest, ClusterState clusterState) {
if (searchRequest.source() == null) {
return Collections.emptyMap();
}
SearchSourceBuilder source = searchRequest.source();
if (source.indexBoosts() == null) {
return Collections.emptyMap();
}
Map<String, Float> concreteIndexBoosts = new HashMap<>();
for (SearchSourceBuilder.IndexBoost ib : source.indexBoosts()) {
Index[] concreteIndices =
indexNameExpressionResolver.concreteIndices(clusterState, searchRequest.indicesOptions(), ib.getIndex());
for (Index concreteIndex : concreteIndices) {
concreteIndexBoosts.putIfAbsent(concreteIndex.getUUID(), ib.getBoost());
}
}
return Collections.unmodifiableMap(concreteIndexBoosts);
}
@Override
protected void doExecute(Task task, SearchRequest searchRequest, ActionListener<SearchResponse> listener) {
// pure paranoia if time goes backwards we are at least positive
final long startTimeInMillis = Math.max(0, System.currentTimeMillis());
ClusterState clusterState = clusterService.state();
clusterState.blocks().globalBlockedRaiseException(ClusterBlockLevel.READ);
// TODO: I think startTime() should become part of ActionRequest and that should be used both for index name
// date math expressions and $now in scripts. This way all apis will deal with now in the same way instead
// of just for the _search api
Index[] indices = indexNameExpressionResolver.concreteIndices(clusterState, searchRequest.indicesOptions(),
startTimeInMillis, searchRequest.indices());
Map<String, AliasFilter> aliasFilter = buildPerIndexAliasFilter(searchRequest, clusterState, indices);
Map<String, Set<String>> routingMap = indexNameExpressionResolver.resolveSearchRouting(clusterState, searchRequest.routing(),
searchRequest.indices());
String[] concreteIndices = new String[indices.length];
for (int i = 0; i < indices.length; i++) {
concreteIndices[i] = indices[i].getName();
}
GroupShardsIterator shardIterators = clusterService.operationRouting().searchShards(clusterState, concreteIndices, routingMap,
searchRequest.preference());
failIfOverShardCountLimit(clusterService, shardIterators.size());
Map<String, Float> concreteIndexBoosts = resolveIndexBoosts(searchRequest, clusterState);
// optimize search type for cases where there is only one shard group to search on
if (shardIterators.size() == 1) {
// if we only have one group, then we always want Q_A_F, no need for DFS, and no need to do THEN since we hit one shard
searchRequest.searchType(QUERY_AND_FETCH);
}
if (searchRequest.isSuggestOnly()) {
// disable request cache if we have only suggest
searchRequest.requestCache(false);
switch (searchRequest.searchType()) {
case DFS_QUERY_AND_FETCH:
case DFS_QUERY_THEN_FETCH:
// convert to Q_T_F if we have only suggest
searchRequest.searchType(QUERY_THEN_FETCH);
break;
}
}
searchAsyncAction((SearchTask)task, searchRequest, shardIterators, startTimeInMillis, clusterState,
Collections.unmodifiableMap(aliasFilter), concreteIndexBoosts, listener).start();
}
@Override
protected final void doExecute(SearchRequest searchRequest, ActionListener<SearchResponse> listener) {
throw new UnsupportedOperationException("the task parameter is required");
}
private AbstractSearchAsyncAction searchAsyncAction(SearchTask task, SearchRequest searchRequest, GroupShardsIterator shardIterators,
long startTime, ClusterState state, Map<String, AliasFilter> aliasFilter,
Map<String, Float> concreteIndexBoosts,
ActionListener<SearchResponse> listener) {
final Function<String, DiscoveryNode> nodesLookup = state.nodes()::get;
final long clusterStateVersion = state.version();
Executor executor = threadPool.executor(ThreadPool.Names.SEARCH);
AbstractSearchAsyncAction searchAsyncAction;
switch(searchRequest.searchType()) {
case DFS_QUERY_THEN_FETCH:
searchAsyncAction = new SearchDfsQueryThenFetchAsyncAction(logger, searchTransportService, nodesLookup,
aliasFilter, concreteIndexBoosts, searchPhaseController, executor, searchRequest, listener, shardIterators, startTime,
clusterStateVersion, task);
break;
case QUERY_THEN_FETCH:
searchAsyncAction = new SearchQueryThenFetchAsyncAction(logger, searchTransportService, nodesLookup,
aliasFilter, concreteIndexBoosts, searchPhaseController, executor, searchRequest, listener, shardIterators, startTime,
clusterStateVersion, task);
break;
case DFS_QUERY_AND_FETCH:
searchAsyncAction = new SearchDfsQueryAndFetchAsyncAction(logger, searchTransportService, nodesLookup,
aliasFilter, concreteIndexBoosts, searchPhaseController, executor, searchRequest, listener, shardIterators, startTime,
clusterStateVersion, task);
break;
case QUERY_AND_FETCH:
searchAsyncAction = new SearchQueryAndFetchAsyncAction(logger, searchTransportService, nodesLookup,
aliasFilter, concreteIndexBoosts, searchPhaseController, executor, searchRequest, listener, shardIterators, startTime,
clusterStateVersion, task);
break;
default:
throw new IllegalStateException("Unknown search type: [" + searchRequest.searchType() + "]");
}
return searchAsyncAction;
}
private void failIfOverShardCountLimit(ClusterService clusterService, int shardCount) {
final long shardCountLimit = clusterService.getClusterSettings().get(SHARD_COUNT_LIMIT_SETTING);
if (shardCount > shardCountLimit) {
throw new IllegalArgumentException("Trying to query " + shardCount + " shards, which is over the limit of "
+ shardCountLimit + ". This limit exists because querying many shards at the same time can make the "
+ "job of the coordinating node very CPU and/or memory intensive. It is usually a better idea to "
+ "have a smaller number of larger shards. Update [" + SHARD_COUNT_LIMIT_SETTING.getKey()
+ "] to a greater value if you really want to query that many shards at the same time.");
}
}
}
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