jtibshirani commented on code in PR #11867:
URL: https://github.com/apache/lucene/pull/11867#discussion_r1001200789


##########
lucene/core/src/test/org/apache/lucene/document/TestManyKnnVectors.java:
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@@ -0,0 +1,135 @@
+/*
+ * 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.document;
+
+import com.carrotsearch.randomizedtesting.annotations.TimeoutSuite;
+import org.apache.lucene.index.DirectoryReader;
+import org.apache.lucene.index.IndexReader;
+import org.apache.lucene.index.IndexWriter;
+import org.apache.lucene.index.IndexWriterConfig;
+import org.apache.lucene.index.LeafReaderContext;
+import org.apache.lucene.index.VectorSimilarityFunction;
+import org.apache.lucene.index.VectorValues;
+import org.apache.lucene.search.Sort;
+import org.apache.lucene.search.SortField;
+import org.apache.lucene.store.Directory;
+import org.apache.lucene.store.FSDirectory;
+import org.apache.lucene.tests.util.LuceneTestCase;
+import org.apache.lucene.tests.util.LuceneTestCase.Monster;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.net.URL;
+import java.nio.ByteBuffer;
+import java.nio.ByteOrder;
+import java.nio.FloatBuffer;
+import java.nio.channels.FileChannel;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+
+import static org.apache.lucene.search.DocIdSetIterator.NO_MORE_DOCS;
+
+
+/**
+ * Tests a large dataset of kNN vectors to check for issues that only show up 
when
+ * segments are very large, like overflow. The dataset is based on the 
StackOverflow
+ * track from Elasticsearch's rally benchmarks: 
https://github.com/elastic/rally-tracks/tree/master/so_vector.
+ *
+ * Steps to run the test
+ *   1. Download the dataset: wget 
https://rally-tracks.elastic.co/so_vector/documents.bin
+ *   2. Move the dataset to the resources folder: mv documents.bin 
lucene/core/src/resources/
+ *   3. Start the test:
+ *     ./gradlew test --tests TestManyKnnVectors.testLargeSegment 
-Dtests.monster=true -Dtests.verbose=true \
+ *       -Dorg.gradle.jvmargs="-Xms2g -Xmx2g" --max-workers=1
+ */
+@TimeoutSuite(millis = 10_800_000) // 3 hour timeout
+@Monster("takes ~2 hours and needs 2GB heap")
+public class TestManyKnnVectors extends LuceneTestCase {
+  public void testLargeSegment() throws Exception {
+    IndexWriterConfig iwc = newIndexWriterConfig();

Review Comment:
   These are good points, I'll push the suggested changes.
   
   I guess my computer is beefier, I completed runs in under 2 hours each and 
confirmed it fails before the change, succeeds after.



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