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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.suggest;
import org.elasticsearch.ElasticsearchException;
import org.elasticsearch.action.ShardOperationFailedException;
import org.elasticsearch.action.support.ActionFilters;
import org.elasticsearch.action.support.DefaultShardOperationFailedException;
import org.elasticsearch.action.support.broadcast.BroadcastShardOperationFailedException;
import org.elasticsearch.action.support.broadcast.TransportBroadcastAction;
import org.elasticsearch.cluster.ClusterService;
import org.elasticsearch.cluster.ClusterState;
import org.elasticsearch.cluster.block.ClusterBlockException;
import org.elasticsearch.cluster.block.ClusterBlockLevel;
import org.elasticsearch.cluster.metadata.IndexNameExpressionResolver;
import org.elasticsearch.cluster.routing.GroupShardsIterator;
import org.elasticsearch.cluster.routing.ShardRouting;
import org.elasticsearch.common.bytes.BytesReference;
import org.elasticsearch.common.inject.Inject;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.common.xcontent.XContentFactory;
import org.elasticsearch.common.xcontent.XContentParser;
import org.elasticsearch.index.IndexService;
import org.elasticsearch.index.engine.Engine;
import org.elasticsearch.index.shard.IndexShard;
import org.elasticsearch.index.suggest.stats.ShardSuggestMetric;
import org.elasticsearch.indices.IndicesService;
import org.elasticsearch.search.suggest.Suggest;
import org.elasticsearch.search.suggest.SuggestPhase;
import org.elasticsearch.search.suggest.SuggestionSearchContext;
import org.elasticsearch.threadpool.ThreadPool;
import org.elasticsearch.transport.TransportService;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.atomic.AtomicReferenceArray;
/**
* Defines the transport of a suggestion request across the cluster
*/
public class TransportSuggestAction extends TransportBroadcastAction<SuggestRequest, SuggestResponse, ShardSuggestRequest, ShardSuggestResponse> {
private final IndicesService indicesService;
private final SuggestPhase suggestPhase;
@Inject
public TransportSuggestAction(Settings settings, ThreadPool threadPool, ClusterService clusterService, TransportService transportService,
IndicesService indicesService, SuggestPhase suggestPhase, ActionFilters actionFilters,
IndexNameExpressionResolver indexNameExpressionResolver) {
super(settings, SuggestAction.NAME, threadPool, clusterService, transportService, actionFilters, indexNameExpressionResolver,
SuggestRequest::new, ShardSuggestRequest::new, ThreadPool.Names.SUGGEST);
this.indicesService = indicesService;
this.suggestPhase = suggestPhase;
}
@Override
protected ShardSuggestRequest newShardRequest(int numShards, ShardRouting shard, SuggestRequest request) {
return new ShardSuggestRequest(shard.shardId(), request);
}
@Override
protected ShardSuggestResponse newShardResponse() {
return new ShardSuggestResponse();
}
@Override
protected GroupShardsIterator shards(ClusterState clusterState, SuggestRequest request, String[] concreteIndices) {
Map<String, Set<String>> routingMap = indexNameExpressionResolver.resolveSearchRouting(clusterState, request.routing(), request.indices());
return clusterService.operationRouting().searchShards(clusterState, concreteIndices, routingMap, request.preference());
}
@Override
protected ClusterBlockException checkGlobalBlock(ClusterState state, SuggestRequest request) {
return state.blocks().globalBlockedException(ClusterBlockLevel.READ);
}
@Override
protected ClusterBlockException checkRequestBlock(ClusterState state, SuggestRequest countRequest, String[] concreteIndices) {
return state.blocks().indicesBlockedException(ClusterBlockLevel.READ, concreteIndices);
}
@Override
protected SuggestResponse newResponse(SuggestRequest request, AtomicReferenceArray shardsResponses, ClusterState clusterState) {
int successfulShards = 0;
int failedShards = 0;
final Map<String, List<Suggest.Suggestion>> groupedSuggestions = new HashMap<>();
List<ShardOperationFailedException> shardFailures = null;
for (int i = 0; i < shardsResponses.length(); i++) {
Object shardResponse = shardsResponses.get(i);
if (shardResponse == null) {
// simply ignore non active shards
} else if (shardResponse instanceof BroadcastShardOperationFailedException) {
failedShards++;
if (shardFailures == null) {
shardFailures = new ArrayList<>();
}
shardFailures.add(new DefaultShardOperationFailedException((BroadcastShardOperationFailedException) shardResponse));
} else {
Suggest suggest = ((ShardSuggestResponse) shardResponse).getSuggest();
Suggest.group(groupedSuggestions, suggest);
successfulShards++;
}
}
return new SuggestResponse(new Suggest(Suggest.reduce(groupedSuggestions)), shardsResponses.length(), successfulShards, failedShards, shardFailures);
}
@Override
protected ShardSuggestResponse shardOperation(ShardSuggestRequest request) {
IndexService indexService = indicesService.indexServiceSafe(request.shardId().getIndex());
IndexShard indexShard = indexService.getShard(request.shardId().id());
ShardSuggestMetric suggestMetric = indexShard.getSuggestMetric();
suggestMetric.preSuggest();
long startTime = System.nanoTime();
XContentParser parser = null;
try (Engine.Searcher searcher = indexShard.acquireSearcher("suggest")) {
BytesReference suggest = request.suggest();
if (suggest != null && suggest.length() > 0) {
parser = XContentFactory.xContent(suggest).createParser(suggest);
if (parser.nextToken() != XContentParser.Token.START_OBJECT) {
throw new IllegalArgumentException("suggest content missing");
}
final SuggestionSearchContext context = suggestPhase.parseElement().parseInternal(parser, indexService.mapperService(),
indexService.fieldData(), request.shardId().getIndexName(), request.shardId().id());
final Suggest result = suggestPhase.execute(context, searcher.searcher());
return new ShardSuggestResponse(request.shardId(), result);
}
return new ShardSuggestResponse(request.shardId(), new Suggest());
} catch (Throwable ex) {
throw new ElasticsearchException("failed to execute suggest", ex);
} finally {
if (parser != null) {
parser.close();
}
suggestMetric.postSuggest(System.nanoTime() - startTime);
}
}
}
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