Add timeout support to AbstractKnnVectorQuery #13202
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,95 @@ | ||
| /* | ||
| * 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.lucene.search; | ||
|
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||
| import java.io.IOException; | ||
| import org.apache.lucene.index.LeafReaderContext; | ||
| import org.apache.lucene.index.QueryTimeout; | ||
| import org.apache.lucene.search.knn.KnnCollectorManager; | ||
|
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| /** A {@link KnnCollectorManager} that collects results with a timeout. */ | ||
| public class TimeLimitingKnnCollectorManager implements KnnCollectorManager { | ||
| private final KnnCollectorManager delegate; | ||
| private final QueryTimeout queryTimeout; | ||
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| public TimeLimitingKnnCollectorManager(KnnCollectorManager delegate, QueryTimeout timeout) { | ||
| this.delegate = delegate; | ||
| this.queryTimeout = timeout; | ||
| } | ||
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| /** Get the configured {@link QueryTimeout} for terminating graph and exact searches. */ | ||
| public QueryTimeout getQueryTimeout() { | ||
| return queryTimeout; | ||
| } | ||
|
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| @Override | ||
| public KnnCollector newCollector(int visitedLimit, LeafReaderContext context) throws IOException { | ||
| KnnCollector collector = delegate.newCollector(visitedLimit, context); | ||
| if (queryTimeout == null) { | ||
| return collector; | ||
| } | ||
| return new KnnCollector() { | ||
| @Override | ||
| public boolean earlyTerminated() { | ||
| return queryTimeout.shouldExit() || collector.earlyTerminated(); | ||
| } | ||
|
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| @Override | ||
| public void incVisitedCount(int count) { | ||
| collector.incVisitedCount(count); | ||
| } | ||
|
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| @Override | ||
| public long visitedCount() { | ||
| return collector.visitedCount(); | ||
| } | ||
|
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| @Override | ||
| public long visitLimit() { | ||
| return collector.visitLimit(); | ||
| } | ||
|
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| @Override | ||
| public int k() { | ||
| return collector.k(); | ||
| } | ||
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| @Override | ||
| public boolean collect(int docId, float similarity) { | ||
| return collector.collect(docId, similarity); | ||
| } | ||
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| @Override | ||
| public float minCompetitiveSimilarity() { | ||
| return collector.minCompetitiveSimilarity(); | ||
| } | ||
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| @Override | ||
| public TopDocs topDocs() { | ||
| TopDocs docs = collector.topDocs(); | ||
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| // Mark results as partial if timeout is met | ||
| TotalHits.Relation relation = | ||
| queryTimeout.shouldExit() | ||
| ? TotalHits.Relation.GREATER_THAN_OR_EQUAL_TO | ||
| : docs.totalHits.relation; | ||
|
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| return new TopDocs(new TotalHits(docs.totalHits.value, relation), docs.scoreDocs); | ||
|
Comment on lines
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There was a problem hiding this comment. Can we simply return There was a problem hiding this comment. I don't think the |
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| } | ||
| }; | ||
| } | ||
| } | ||
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Ah, so both
searchLevel()andfindBestEntryPoint()inHnswGraphSearchercheckearlyTerminated()on their collector to abort the search, so configuring the timeout check allows us to preempt the approximate search.