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Move Aggregator#buildTopLevel() to search worker thread. (#98715)
This commit introduces an AggregatorCollector that contains a finish method which performs aggregation post-collection and builds the internal aggregation for this collector. This method is called on the worker thread at the end of the collection phase.
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61 changes: 61 additions & 0 deletions
61
server/src/main/java/org/elasticsearch/search/aggregations/AggregatorCollector.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,61 @@ | ||
| /* | ||
| * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one | ||
| * or more contributor license agreements. Licensed under the Elastic License | ||
| * 2.0 and the Server Side Public License, v 1; you may not use this file except | ||
| * in compliance with, at your election, the Elastic License 2.0 or the Server | ||
| * Side Public License, v 1. | ||
| */ | ||
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| package org.elasticsearch.search.aggregations; | ||
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| import org.apache.lucene.index.LeafReaderContext; | ||
| import org.apache.lucene.search.LeafCollector; | ||
| import org.apache.lucene.search.ScoreMode; | ||
| import org.elasticsearch.search.internal.TwoPhaseCollector; | ||
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| import java.io.IOException; | ||
| import java.util.ArrayList; | ||
| import java.util.Arrays; | ||
| import java.util.List; | ||
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| /** Collector that controls the life cycle of an aggregation document collection. */ | ||
| public class AggregatorCollector implements TwoPhaseCollector { | ||
| final Aggregator[] aggregators; | ||
| final BucketCollector bucketCollector; | ||
| final List<InternalAggregation> internalAggregations; | ||
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| public AggregatorCollector(Aggregator[] aggregators, BucketCollector bucketCollector) { | ||
| this.aggregators = aggregators; | ||
| this.bucketCollector = bucketCollector; | ||
| this.internalAggregations = new ArrayList<>(aggregators.length); | ||
| } | ||
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| @Override | ||
| public LeafCollector getLeafCollector(LeafReaderContext context) throws IOException { | ||
| return bucketCollector.getLeafCollector(new AggregationExecutionContext(context, null, null, null)); | ||
| } | ||
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| @Override | ||
| public ScoreMode scoreMode() { | ||
| return bucketCollector.scoreMode(); | ||
| } | ||
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| @Override | ||
| public void doPostCollection() throws IOException { | ||
| bucketCollector.postCollection(); | ||
| for (Aggregator aggregator : aggregators) { | ||
| internalAggregations.add(aggregator.buildTopLevel()); | ||
| // release the aggregator to claim the used bytes as we don't need it anymore | ||
| aggregator.releaseAggregations(); | ||
| } | ||
| } | ||
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| @Override | ||
| public String toString() { | ||
| String[] aggNames = new String[aggregators.length]; | ||
| for (int i = 0; i < aggregators.length; i++) { | ||
| aggNames[i] = aggregators[i].name(); | ||
| } | ||
| return Arrays.toString(aggNames); | ||
| } | ||
| } |
55 changes: 55 additions & 0 deletions
55
server/src/main/java/org/elasticsearch/search/aggregations/AggregatorCollectorManager.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,55 @@ | ||
| /* | ||
| * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one | ||
| * or more contributor license agreements. Licensed under the Elastic License | ||
| * 2.0 and the Server Side Public License, v 1; you may not use this file except | ||
| * in compliance with, at your election, the Elastic License 2.0 or the Server | ||
| * Side Public License, v 1. | ||
| */ | ||
|
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| package org.elasticsearch.search.aggregations; | ||
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| import org.apache.lucene.search.CollectorManager; | ||
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| import java.io.IOException; | ||
| import java.util.ArrayList; | ||
| import java.util.Collection; | ||
| import java.util.List; | ||
| import java.util.function.Consumer; | ||
| import java.util.function.Supplier; | ||
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| /** Collector manager that produces {@link AggregatorCollector} and merges them during the reduce phase. */ | ||
| public class AggregatorCollectorManager implements CollectorManager<AggregatorCollector, Void> { | ||
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| private final Supplier<AggregatorCollector> collectorSupplier; | ||
| private final Consumer<InternalAggregations> internalAggregationsConsumer; | ||
| private final Supplier<AggregationReduceContext> reduceContextSupplier; | ||
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| public AggregatorCollectorManager( | ||
| Supplier<AggregatorCollector> collectorSupplier, | ||
| Consumer<InternalAggregations> internalAggregationsConsumer, | ||
| Supplier<AggregationReduceContext> reduceContextSupplier | ||
| ) { | ||
| this.collectorSupplier = collectorSupplier; | ||
| this.internalAggregationsConsumer = internalAggregationsConsumer; | ||
| this.reduceContextSupplier = reduceContextSupplier; | ||
| } | ||
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| @Override | ||
| public AggregatorCollector newCollector() throws IOException { | ||
| return collectorSupplier.get(); | ||
| } | ||
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| @Override | ||
| public Void reduce(Collection<AggregatorCollector> collectors) throws IOException { | ||
| if (collectors.size() > 1) { | ||
| // we execute this search using more than one slice. In order to keep memory requirements | ||
| // low, we do a partial reduction here. | ||
| final List<InternalAggregations> internalAggregations = new ArrayList<>(collectors.size()); | ||
| collectors.forEach(c -> internalAggregations.add(InternalAggregations.from(c.internalAggregations))); | ||
| internalAggregationsConsumer.accept(InternalAggregations.topLevelReduce(internalAggregations, reduceContextSupplier.get())); | ||
| } else if (collectors.size() == 1) { | ||
| internalAggregationsConsumer.accept(InternalAggregations.from(collectors.iterator().next().internalAggregations)); | ||
| } | ||
| return null; | ||
| } | ||
| } |
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