gaobinlong commented on code in PR #15795: URL: https://github.com/apache/lucene/pull/15795#discussion_r3353095840
########## lucene/misc/src/java/org/apache/lucene/misc/search/MemoryAccountingBitsetCollectorManager.java: ########## @@ -0,0 +1,69 @@ +/* + * 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.misc.search; + +import java.util.Collection; +import org.apache.lucene.misc.CollectorMemoryTracker; +import org.apache.lucene.search.CollectorManager; +import org.apache.lucene.util.FixedBitSet; + +/** + * CollectorManager for MemoryAccountingBitsetCollector that supports concurrent search. + * + * <p>Creates multiple collectors for concurrent execution, each collector only allocates bitset for + * segments it processes, then merges with proper offset in reduce(). + */ +public class MemoryAccountingBitsetCollectorManager + implements CollectorManager< + MemoryAccountingBitsetCollector, MemoryAccountingBitsetCollectorManager.Result> { + + /** The result of a search, containing the matched document IDs and total memory used. */ + public record Result(FixedBitSet bitSet, long totalBytesUsed) {} + + private final CollectorMemoryTracker tracker; + + public MemoryAccountingBitsetCollectorManager(CollectorMemoryTracker tracker) { + this.tracker = tracker; + } + + @Override + public MemoryAccountingBitsetCollector newCollector() { + return new MemoryAccountingBitsetCollector(tracker, true); + } + + @Override + public Result reduce(Collection<MemoryAccountingBitsetCollector> collectors) { + int globalMaxDocEnd = 0; + for (MemoryAccountingBitsetCollector collector : collectors) { + globalMaxDocEnd = Math.max(globalMaxDocEnd, collector.getMaxDocEnd()); + } + + // TODO: with intra-segment concurrency enabled, globalMaxDocEnd equals the full index maxDoc + // even when only a portion of the index was searched, causing over-allocation of the result + // bitset. + FixedBitSet result = new FixedBitSet(globalMaxDocEnd); + + for (MemoryAccountingBitsetCollector collector : collectors) { + if (collector.bitSet != null && collector.bitSet.length() > 0) { + int length = collector.getMaxDocEnd() - collector.getMinDocBase(); + FixedBitSet.orRange(collector.bitSet, 0, result, collector.getMinDocBase(), length); Review Comment: Yes, changed that. -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected] --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
