kaivalnp commented on code in PR #14178: URL: https://github.com/apache/lucene/pull/14178#discussion_r2109479695
########## lucene/sandbox/src/java/org/apache/lucene/sandbox/codecs/faiss/FaissKnnVectorsFormat.java: ########## @@ -0,0 +1,93 @@ +/* + * 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.sandbox.codecs.faiss; + +import java.io.IOException; +import java.util.Locale; +import org.apache.lucene.codecs.KnnVectorsFormat; +import org.apache.lucene.codecs.KnnVectorsReader; +import org.apache.lucene.codecs.KnnVectorsWriter; +import org.apache.lucene.codecs.hnsw.FlatVectorScorerUtil; +import org.apache.lucene.codecs.hnsw.FlatVectorsFormat; +import org.apache.lucene.codecs.lucene99.Lucene99FlatVectorsFormat; +import org.apache.lucene.index.SegmentReadState; +import org.apache.lucene.index.SegmentWriteState; + +/** + * A format which uses <a href="https://github.com/facebookresearch/faiss";>Faiss</a> to create and + * search vector indexes, using {@link LibFaissC} to interact with the native library. + * + * <p>A separate Faiss index is created per-segment, and uses the following files: + * + * <ul> + * <li><code>.faissm</code> (metadata file): stores field number, offset and length of actual + * Faiss index in data file. + * <li><code>.faissd</code> (data file): stores concatenated Faiss indexes for all fields. + * <li>All files required by {@link Lucene99FlatVectorsFormat} for storing raw vectors. + * </ul> + * + * <p>Note: Set the {@code $OMP_NUM_THREADS} environment variable to control internal threading. Review Comment: Makes sense, I'll add it ########## lucene/sandbox/src/java/org/apache/lucene/sandbox/codecs/faiss/FaissKnnVectorsReader.java: ########## @@ -0,0 +1,195 @@ +/* + * 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.sandbox.codecs.faiss; + +import static org.apache.lucene.sandbox.codecs.faiss.FaissKnnVectorsFormat.DATA_CODEC_NAME; +import static org.apache.lucene.sandbox.codecs.faiss.FaissKnnVectorsFormat.DATA_EXTENSION; +import static org.apache.lucene.sandbox.codecs.faiss.FaissKnnVectorsFormat.META_CODEC_NAME; +import static org.apache.lucene.sandbox.codecs.faiss.FaissKnnVectorsFormat.META_EXTENSION; +import static org.apache.lucene.sandbox.codecs.faiss.FaissKnnVectorsFormat.VERSION_CURRENT; +import static org.apache.lucene.sandbox.codecs.faiss.FaissKnnVectorsFormat.VERSION_START; +import static org.apache.lucene.sandbox.codecs.faiss.LibFaissC.indexRead; +import static org.apache.lucene.sandbox.codecs.faiss.LibFaissC.indexSearch; + +import java.io.IOException; +import java.lang.foreign.Arena; +import java.lang.foreign.MemorySegment; +import java.util.HashMap; +import java.util.Map; +import org.apache.lucene.codecs.CodecUtil; +import org.apache.lucene.codecs.KnnVectorsReader; +import org.apache.lucene.codecs.hnsw.FlatVectorsReader; +import org.apache.lucene.index.ByteVectorValues; +import org.apache.lucene.index.FieldInfo; +import org.apache.lucene.index.FloatVectorValues; +import org.apache.lucene.index.IndexFileNames; +import org.apache.lucene.index.SegmentReadState; +import org.apache.lucene.index.VectorSimilarityFunction; +import org.apache.lucene.search.KnnCollector; +import org.apache.lucene.store.DataAccessHint; +import org.apache.lucene.store.FileTypeHint; +import org.apache.lucene.store.IOContext; +import org.apache.lucene.store.IndexInput; +import org.apache.lucene.util.Bits; +import org.apache.lucene.util.IOUtils; + +/** + * Read per-segment Faiss indexes and associated metadata. + * + * @lucene.experimental + */ +final class FaissKnnVectorsReader extends KnnVectorsReader { + private final FlatVectorsReader rawVectorsReader; + private final IndexInput meta, data; + private final Map<String, IndexEntry> indexMap; + private final Arena arena; + private boolean closed; + + public FaissKnnVectorsReader(SegmentReadState state, FlatVectorsReader rawVectorsReader) + throws IOException { + this.rawVectorsReader = rawVectorsReader; + this.indexMap = new HashMap<>(); + this.arena = Arena.ofShared(); + this.closed = false; + + boolean failure = true; + try { + meta = + openInput( + state, + META_EXTENSION, + META_CODEC_NAME, + VERSION_START, + VERSION_CURRENT, + state.context); + data = + openInput( + state, + DATA_EXTENSION, + DATA_CODEC_NAME, + VERSION_START, + VERSION_CURRENT, + state.context.withHints(FileTypeHint.DATA, DataAccessHint.RANDOM)); + + Map.Entry<String, IndexEntry> entry; + while ((entry = parseNextField(state)) != null) { + this.indexMap.put(entry.getKey(), entry.getValue()); + } + + failure = false; + } finally { + if (failure) { + IOUtils.closeWhileHandlingException(this); + } + } + } + + @SuppressWarnings("SameParameterValue") + private IndexInput openInput( + SegmentReadState state, + String extension, + String codecName, + int versionStart, + int versionEnd, + IOContext context) + throws IOException { + + String fileName = + IndexFileNames.segmentFileName(state.segmentInfo.name, state.segmentSuffix, extension); + IndexInput input = state.directory.openInput(fileName, context); + CodecUtil.checkIndexHeader( + input, codecName, versionStart, versionEnd, state.segmentInfo.getId(), state.segmentSuffix); + return input; + } + + private Map.Entry<String, IndexEntry> parseNextField(SegmentReadState state) throws IOException { + int fieldNumber = meta.readInt(); + if (fieldNumber == -1) { + return null; + } + + FieldInfo fieldInfo = state.fieldInfos.fieldInfo(fieldNumber); + if (fieldInfo == null) { + throw new IllegalStateException("Invalid field"); Review Comment: Makes sense, I'll add it -- This is an automated message from the Apache Git Service. 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