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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.search.type.*;
import org.elasticsearch.action.support.ActionFilters;
import org.elasticsearch.action.support.HandledTransportAction;
import org.elasticsearch.cluster.ClusterService;
import org.elasticsearch.cluster.ClusterState;
import org.elasticsearch.cluster.metadata.IndexNameExpressionResolver;
import org.elasticsearch.common.inject.Inject;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.index.IndexNotFoundException;
import org.elasticsearch.indices.IndexClosedException;
import org.elasticsearch.threadpool.ThreadPool;
import org.elasticsearch.transport.TransportService;
import java.util.Map;
import java.util.Set;
import static org.elasticsearch.action.search.SearchType.*;
/**
*
*/
public class TransportSearchAction extends HandledTransportAction<SearchRequest, SearchResponse> {
private final ClusterService clusterService;
private final TransportSearchDfsQueryThenFetchAction dfsQueryThenFetchAction;
private final TransportSearchQueryThenFetchAction queryThenFetchAction;
private final TransportSearchDfsQueryAndFetchAction dfsQueryAndFetchAction;
private final TransportSearchQueryAndFetchAction queryAndFetchAction;
private final boolean optimizeSingleShard;
@Inject
public TransportSearchAction(Settings settings, ThreadPool threadPool,
TransportService transportService, ClusterService clusterService,
TransportSearchDfsQueryThenFetchAction dfsQueryThenFetchAction,
TransportSearchQueryThenFetchAction queryThenFetchAction,
TransportSearchDfsQueryAndFetchAction dfsQueryAndFetchAction,
TransportSearchQueryAndFetchAction queryAndFetchAction,
ActionFilters actionFilters, IndexNameExpressionResolver indexNameExpressionResolver) {
super(settings, SearchAction.NAME, threadPool, transportService, actionFilters, indexNameExpressionResolver, SearchRequest::new);
this.clusterService = clusterService;
this.dfsQueryThenFetchAction = dfsQueryThenFetchAction;
this.queryThenFetchAction = queryThenFetchAction;
this.dfsQueryAndFetchAction = dfsQueryAndFetchAction;
this.queryAndFetchAction = queryAndFetchAction;
this.optimizeSingleShard = this.settings.getAsBoolean("action.search.optimize_single_shard", true);
}
@Override
protected void doExecute(SearchRequest searchRequest, ActionListener<SearchResponse> listener) {
// optimize search type for cases where there is only one shard group to search on
if (optimizeSingleShard) {
try {
ClusterState clusterState = clusterService.state();
String[] concreteIndices = indexNameExpressionResolver.concreteIndices(clusterState, searchRequest);
Map<String, Set<String>> routingMap = indexNameExpressionResolver.resolveSearchRouting(clusterState, searchRequest.routing(), searchRequest.indices());
int shardCount = clusterService.operationRouting().searchShardsCount(clusterState, concreteIndices, routingMap);
if (shardCount == 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);
}
} catch (IndexNotFoundException | IndexClosedException e) {
// ignore these failures, we will notify the search response if its really the case from the actual action
} catch (Exception e) {
logger.debug("failed to optimize search type, continue as normal", e);
}
}
if (searchRequest.searchType() == DFS_QUERY_THEN_FETCH) {
dfsQueryThenFetchAction.execute(searchRequest, listener);
} else if (searchRequest.searchType() == SearchType.QUERY_THEN_FETCH) {
queryThenFetchAction.execute(searchRequest, listener);
} else if (searchRequest.searchType() == SearchType.DFS_QUERY_AND_FETCH) {
dfsQueryAndFetchAction.execute(searchRequest, listener);
} else if (searchRequest.searchType() == SearchType.QUERY_AND_FETCH) {
queryAndFetchAction.execute(searchRequest, listener);
} else {
throw new IllegalStateException("Unknown search type: [" + searchRequest.searchType() + "]");
}
}
}
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