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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.fieldstats;
import org.apache.lucene.index.IndexReader;
import org.apache.lucene.index.MultiFields;
import org.apache.lucene.index.Terms;
import org.elasticsearch.ExceptionsHelper;
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.inject.Inject;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.index.IndexService;
import org.elasticsearch.index.engine.Engine;
import org.elasticsearch.index.mapper.MappedFieldType;
import org.elasticsearch.index.mapper.MapperService;
import org.elasticsearch.index.shard.IndexShard;
import org.elasticsearch.index.shard.ShardId;
import org.elasticsearch.indices.IndicesService;
import org.elasticsearch.threadpool.ThreadPool;
import org.elasticsearch.transport.TransportService;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.atomic.AtomicReferenceArray;
public class TransportFieldStatsTransportAction extends TransportBroadcastAction<FieldStatsRequest, FieldStatsResponse, FieldStatsShardRequest, FieldStatsShardResponse> {
private final IndicesService indicesService;
@Inject
public TransportFieldStatsTransportAction(Settings settings, ThreadPool threadPool, ClusterService clusterService,
TransportService transportService, ActionFilters actionFilters,
IndexNameExpressionResolver indexNameExpressionResolver, IndicesService indicesService) {
super(settings, FieldStatsAction.NAME, threadPool, clusterService, transportService, actionFilters, indexNameExpressionResolver, FieldStatsRequest::new, FieldStatsShardRequest::new, ThreadPool.Names.MANAGEMENT);
this.indicesService = indicesService;
}
@Override
protected FieldStatsResponse newResponse(FieldStatsRequest request, AtomicReferenceArray shardsResponses, ClusterState clusterState) {
int successfulShards = 0;
int failedShards = 0;
Map<String, Map<String, FieldStats>> indicesMergedFieldStats = new HashMap<>();
List<ShardOperationFailedException> shardFailures = new ArrayList<>();
for (int i = 0; i < shardsResponses.length(); i++) {
Object shardValue = shardsResponses.get(i);
if (shardValue == null) {
// simply ignore non active shards
} else if (shardValue instanceof BroadcastShardOperationFailedException) {
failedShards++;
shardFailures.add(new DefaultShardOperationFailedException((BroadcastShardOperationFailedException) shardValue));
} else {
successfulShards++;
FieldStatsShardResponse shardResponse = (FieldStatsShardResponse) shardValue;
final String indexName;
if ("cluster".equals(request.level())) {
indexName = "_all";
} else if ("indices".equals(request.level())) {
indexName = shardResponse.getIndex();
} else {
// should already have been caught by the FieldStatsRequest#validate(...)
throw new IllegalArgumentException("Illegal level option [" + request.level() + "]");
}
Map<String, FieldStats> indexMergedFieldStats = indicesMergedFieldStats.get(indexName);
if (indexMergedFieldStats == null) {
indicesMergedFieldStats.put(indexName, indexMergedFieldStats = new HashMap<>());
}
Map<String, FieldStats> fieldStats = shardResponse.getFieldStats();
for (Map.Entry<String, FieldStats> entry : fieldStats.entrySet()) {
FieldStats existing = indexMergedFieldStats.get(entry.getKey());
if (existing != null) {
if (existing.getType() != entry.getValue().getType()) {
throw new IllegalStateException(
"trying to merge the field stats of field [" + entry.getKey() + "] from index [" + shardResponse.getIndex() + "] but the field type is incompatible, try to set the 'level' option to 'indices'"
);
}
existing.append(entry.getValue());
} else {
indexMergedFieldStats.put(entry.getKey(), entry.getValue());
}
}
}
}
if (request.getIndexConstraints().length != 0) {
Set<String> fieldStatFields = new HashSet<>(Arrays.asList(request.getFields()));
for (IndexConstraint indexConstraint : request.getIndexConstraints()) {
Iterator<Map.Entry<String, Map<String, FieldStats>>> iterator = indicesMergedFieldStats.entrySet().iterator();
while (iterator.hasNext()) {
Map.Entry<String, Map<String, FieldStats>> entry = iterator.next();
FieldStats indexConstraintFieldStats = entry.getValue().get(indexConstraint.getField());
if (indexConstraintFieldStats != null && indexConstraintFieldStats.match(indexConstraint)) {
// If the field stats didn't occur in the list of fields in the original request we need to remove the
// field stats, because it was never requested and was only needed to validate the index constraint
if (fieldStatFields.contains(indexConstraint.getField()) == false) {
entry.getValue().remove(indexConstraint.getField());
}
} else {
// The index constraint didn't match or was empty, so we remove all the field stats of the index we're checking
iterator.remove();
}
}
}
}
return new FieldStatsResponse(shardsResponses.length(), successfulShards, failedShards, shardFailures, indicesMergedFieldStats);
}
@Override
protected FieldStatsShardRequest newShardRequest(int numShards, ShardRouting shard, FieldStatsRequest request) {
return new FieldStatsShardRequest(shard.shardId(), request);
}
@Override
protected FieldStatsShardResponse newShardResponse() {
return new FieldStatsShardResponse();
}
@Override
protected FieldStatsShardResponse shardOperation(FieldStatsShardRequest request) {
ShardId shardId = request.shardId();
Map<String, FieldStats> fieldStats = new HashMap<>();
IndexService indexServices = indicesService.indexServiceSafe(shardId.getIndex());
MapperService mapperService = indexServices.mapperService();
IndexShard shard = indexServices.getShard(shardId.id());
try (Engine.Searcher searcher = shard.acquireSearcher("fieldstats")) {
for (String field : request.getFields()) {
MappedFieldType fieldType = mapperService.fullName(field);
if (fieldType != null) {
IndexReader reader = searcher.reader();
Terms terms = MultiFields.getTerms(reader, field);
if (terms != null) {
fieldStats.put(field, fieldType.stats(terms, reader.maxDoc()));
}
} else {
throw new IllegalArgumentException("field [" + field + "] doesn't exist");
}
}
} catch (IOException e) {
throw ExceptionsHelper.convertToElastic(e);
}
return new FieldStatsShardResponse(shardId, fieldStats);
}
@Override
protected GroupShardsIterator shards(ClusterState clusterState, FieldStatsRequest request, String[] concreteIndices) {
return clusterService.operationRouting().searchShards(clusterState, concreteIndices, null, null);
}
@Override
protected ClusterBlockException checkGlobalBlock(ClusterState state, FieldStatsRequest request) {
return state.blocks().globalBlockedException(ClusterBlockLevel.READ);
}
@Override
protected ClusterBlockException checkRequestBlock(ClusterState state, FieldStatsRequest request, String[] concreteIndices) {
return state.blocks().indicesBlockedException(ClusterBlockLevel.READ, concreteIndices);
}
}
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