org.elasticsearch.action.search.TransportSearchAction Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of elasticsearch Show documentation
Show all versions of elasticsearch Show documentation
Elasticsearch subproject :server
/*
* 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.common.util.BigArrays;
import org.elasticsearch.script.ScriptService;
import org.elasticsearch.search.SearchService;
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 {
/** The maximum number of shards for a single search request. */
public static final Setting 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, BigArrays bigArrays, ScriptService scriptService,
TransportService transportService, SearchService searchService,
ClusterService clusterService, ActionFilters actionFilters, IndexNameExpressionResolver
indexNameExpressionResolver) {
super(settings, SearchAction.NAME, threadPool, transportService, actionFilters, indexNameExpressionResolver, SearchRequest::new);
this.searchPhaseController = new SearchPhaseController(settings, bigArrays, scriptService);
this.searchTransportService = new SearchTransportService(settings, transportService);
SearchTransportService.registerRequestHandler(transportService, searchService);
this.clusterService = clusterService;
this.searchService = searchService;
}
private Map buildPerIndexAliasFilter(SearchRequest request, ClusterState clusterState, String...concreteIndices) {
final Map aliasFilterMap = new HashMap<>();
for (String index : concreteIndices) {
clusterState.blocks().indexBlockedRaiseException(ClusterBlockLevel.READ, index);
AliasFilter aliasFilter = searchService.buildAliasFilter(clusterState, index, request.indices());
if (aliasFilter != null) {
aliasFilterMap.put(index, aliasFilter);
}
}
return aliasFilterMap;
}
@Override
protected void doExecute(Task task, SearchRequest searchRequest, ActionListener 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
String[] concreteIndices = indexNameExpressionResolver.concreteIndexNames(clusterState, searchRequest.indicesOptions(),
startTimeInMillis, searchRequest.indices());
Map aliasFilter = buildPerIndexAliasFilter(searchRequest, clusterState, concreteIndices);
Map> routingMap = indexNameExpressionResolver.resolveSearchRouting(clusterState, searchRequest.routing(),
searchRequest.indices());
GroupShardsIterator shardIterators = clusterService.operationRouting().searchShards(clusterState, concreteIndices, routingMap,
searchRequest.preference());
failIfOverShardCountLimit(clusterService, shardIterators.size());
// 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), listener).start();
}
@Override
protected final void doExecute(SearchRequest searchRequest, ActionListener listener) {
throw new UnsupportedOperationException("the task parameter is required");
}
private AbstractSearchAsyncAction searchAsyncAction(SearchTask task, SearchRequest searchRequest, GroupShardsIterator shardIterators,
long startTime, ClusterState state, Map aliasFilter,
ActionListener listener) {
final Function 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, searchPhaseController, executor, searchRequest, listener, shardIterators, startTime,
clusterStateVersion, task);
break;
case QUERY_THEN_FETCH:
searchAsyncAction = new SearchQueryThenFetchAsyncAction(logger, searchTransportService, nodesLookup,
aliasFilter, searchPhaseController, executor, searchRequest, listener, shardIterators, startTime,
clusterStateVersion, task);
break;
case DFS_QUERY_AND_FETCH:
searchAsyncAction = new SearchDfsQueryAndFetchAsyncAction(logger, searchTransportService, nodesLookup,
aliasFilter, searchPhaseController, executor, searchRequest, listener, shardIterators, startTime,
clusterStateVersion, task);
break;
case QUERY_AND_FETCH:
searchAsyncAction = new SearchQueryAndFetchAsyncAction(logger, searchTransportService, nodesLookup,
aliasFilter, 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.");
}
}
}