| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF 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.apache.solr.search.grouping.distributed.requestfactory; |
| |
| import org.apache.lucene.analysis.reverse.ReverseStringFilter; |
| import org.apache.lucene.search.grouping.SearchGroup; |
| import org.apache.lucene.util.BytesRef; |
| import org.apache.lucene.util.CharsRefBuilder; |
| import org.apache.solr.common.params.CommonParams; |
| import org.apache.solr.common.params.GroupParams; |
| import org.apache.solr.common.params.ModifiableSolrParams; |
| import org.apache.solr.common.params.ShardParams; |
| import org.apache.solr.handler.component.ResponseBuilder; |
| import org.apache.solr.handler.component.ShardRequest; |
| import org.apache.solr.schema.FieldType; |
| import org.apache.solr.schema.IndexSchema; |
| import org.apache.solr.search.Grouping; |
| import org.apache.solr.search.SolrIndexSearcher; |
| import org.apache.solr.search.grouping.distributed.ShardRequestFactory; |
| |
| import java.util.Collection; |
| import java.util.HashSet; |
| import java.util.Map; |
| import java.util.Set; |
| |
| /** |
| * Concrete implementation of {@link ShardRequestFactory} that creates {@link ShardRequest} instances for getting the |
| * top groups from all shards. |
| */ |
| public class TopGroupsShardRequestFactory implements ShardRequestFactory { |
| |
| /** |
| * Represents a string value for |
| */ |
| public static final String GROUP_NULL_VALUE = "" + ReverseStringFilter.START_OF_HEADING_MARKER; |
| |
| @Override |
| public ShardRequest[] constructRequest(ResponseBuilder rb) { |
| // If we have a group.query we need to query all shards... Or we move this to the group first phase queries |
| boolean containsGroupByQuery = rb.getGroupingSpec().getQueries().length > 0; |
| // TODO: If groups.truncate=true we only have to query the specific shards even faceting and statistics are enabled |
| if (rb.isNeedDocSet() || containsGroupByQuery) { |
| // In case we need more results such as faceting and statistics we have to query all shards |
| return createRequestForAllShards(rb); |
| } else { |
| // In case we only need top groups we only have to query the shards that contain these groups. |
| return createRequestForSpecificShards(rb); |
| } |
| } |
| |
| private ShardRequest[] createRequestForSpecificShards(ResponseBuilder rb) { |
| // Determine all unique shards to query for TopGroups |
| Set<String> uniqueShards = new HashSet<>(); |
| for (Map<SearchGroup<BytesRef>, Set<String>> groupsToShard : rb.searchGroupToShards.values()) { |
| for (Set<String> shards : groupsToShard.values()) { |
| uniqueShards.addAll(shards); |
| } |
| } |
| |
| return createRequest(rb, uniqueShards.toArray(new String[uniqueShards.size()])); |
| } |
| |
| private ShardRequest[] createRequestForAllShards(ResponseBuilder rb) { |
| return createRequest(rb, ShardRequest.ALL_SHARDS); |
| } |
| |
| private ShardRequest[] createRequest(ResponseBuilder rb, String[] shards) |
| { |
| ShardRequest sreq = new ShardRequest(); |
| sreq.shards = shards; |
| sreq.purpose = ShardRequest.PURPOSE_GET_TOP_IDS; |
| sreq.params = new ModifiableSolrParams(rb.req.getParams()); |
| |
| // If group.format=simple group.offset doesn't make sense |
| Grouping.Format responseFormat = rb.getGroupingSpec().getResponseFormat(); |
| if (responseFormat == Grouping.Format.simple || rb.getGroupingSpec().isMain()) { |
| sreq.params.remove(GroupParams.GROUP_OFFSET); |
| } |
| |
| sreq.params.remove(ShardParams.SHARDS); |
| |
| // set the start (offset) to 0 for each shard request so we can properly merge |
| // results from the start. |
| if (rb.shards_start > -1) { |
| // if the client set shards.start set this explicitly |
| sreq.params.set(CommonParams.START, rb.shards_start); |
| } else { |
| sreq.params.set(CommonParams.START, "0"); |
| } |
| if (rb.shards_rows > -1) { |
| // if the client set shards.rows set this explicitly |
| sreq.params.set(CommonParams.ROWS, rb.shards_rows); |
| } else { |
| sreq.params.set(CommonParams.ROWS, rb.getSortSpec().getOffset() + rb.getSortSpec().getCount()); |
| } |
| |
| sreq.params.set(GroupParams.GROUP_DISTRIBUTED_SECOND, "true"); |
| final IndexSchema schema = rb.req.getSearcher().getSchema(); |
| for (Map.Entry<String, Collection<SearchGroup<BytesRef>>> entry : rb.mergedSearchGroups.entrySet()) { |
| for (SearchGroup<BytesRef> searchGroup : entry.getValue()) { |
| String groupValue; |
| if (searchGroup.groupValue != null) { |
| FieldType fieldType = schema.getField(entry.getKey()).getType(); |
| groupValue = fieldType.indexedToReadable(searchGroup.groupValue, new CharsRefBuilder()).toString(); |
| } else { |
| groupValue = GROUP_NULL_VALUE; |
| } |
| sreq.params.add(GroupParams.GROUP_DISTRIBUTED_TOPGROUPS_PREFIX + entry.getKey(), groupValue); |
| } |
| } |
| |
| if ((rb.getFieldFlags() & SolrIndexSearcher.GET_SCORES) != 0 || rb.getSortSpec().includesScore()) { |
| sreq.params.set(CommonParams.FL, schema.getUniqueKeyField().getName() + ",score"); |
| } else { |
| sreq.params.set(CommonParams.FL, schema.getUniqueKeyField().getName()); |
| } |
| |
| int origTimeAllowed = sreq.params.getInt(CommonParams.TIME_ALLOWED, -1); |
| if (origTimeAllowed > 0) { |
| sreq.params.set(CommonParams.TIME_ALLOWED, Math.max(1,origTimeAllowed - rb.firstPhaseElapsedTime)); |
| } |
| |
| return new ShardRequest[] {sreq}; |
| } |
| |
| } |