mayya-sharipova commented on code in PR #792: URL: https://github.com/apache/lucene/pull/792#discussion_r851785737
########## lucene/core/src/java/org/apache/lucene/codecs/lucene92/Lucene92HnswVectorsWriter.java: ########## @@ -0,0 +1,328 @@ +/* + * 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.codecs.lucene92; + +import static org.apache.lucene.codecs.lucene92.Lucene92HnswVectorsFormat.DIRECT_MONOTONIC_BLOCK_SHIFT; +import static org.apache.lucene.search.DocIdSetIterator.NO_MORE_DOCS; + +import java.io.IOException; +import java.util.Arrays; +import org.apache.lucene.codecs.CodecUtil; +import org.apache.lucene.codecs.KnnVectorsReader; +import org.apache.lucene.codecs.KnnVectorsWriter; +import org.apache.lucene.codecs.lucene90.IndexedDISI; +import org.apache.lucene.index.DocsWithFieldSet; +import org.apache.lucene.index.FieldInfo; +import org.apache.lucene.index.IndexFileNames; +import org.apache.lucene.index.RandomAccessVectorValuesProducer; +import org.apache.lucene.index.SegmentWriteState; +import org.apache.lucene.index.VectorSimilarityFunction; +import org.apache.lucene.index.VectorValues; +import org.apache.lucene.search.DocIdSetIterator; +import org.apache.lucene.store.IndexInput; +import org.apache.lucene.store.IndexOutput; +import org.apache.lucene.util.BytesRef; +import org.apache.lucene.util.IOUtils; +import org.apache.lucene.util.hnsw.HnswGraph.NodesIterator; +import org.apache.lucene.util.hnsw.HnswGraphBuilder; +import org.apache.lucene.util.hnsw.NeighborArray; +import org.apache.lucene.util.hnsw.OnHeapHnswGraph; +import org.apache.lucene.util.packed.DirectMonotonicWriter; + +/** + * Writes vector values and knn graphs to index segments. + * + * @lucene.experimental + */ +public final class Lucene92HnswVectorsWriter extends KnnVectorsWriter { + + private final SegmentWriteState segmentWriteState; + private final IndexOutput meta, vectorData, vectorIndex; + private final int maxDoc; + + private final int maxConn; + private final int beamWidth; + private boolean finished; + + Lucene92HnswVectorsWriter(SegmentWriteState state, int maxConn, int beamWidth) + throws IOException { + this.maxConn = maxConn; + this.beamWidth = beamWidth; + + assert state.fieldInfos.hasVectorValues(); + segmentWriteState = state; + + String metaFileName = + IndexFileNames.segmentFileName( + state.segmentInfo.name, state.segmentSuffix, Lucene92HnswVectorsFormat.META_EXTENSION); + + String vectorDataFileName = + IndexFileNames.segmentFileName( + state.segmentInfo.name, + state.segmentSuffix, + Lucene92HnswVectorsFormat.VECTOR_DATA_EXTENSION); + + String indexDataFileName = + IndexFileNames.segmentFileName( + state.segmentInfo.name, + state.segmentSuffix, + Lucene92HnswVectorsFormat.VECTOR_INDEX_EXTENSION); + + boolean success = false; + try { + meta = state.directory.createOutput(metaFileName, state.context); + vectorData = state.directory.createOutput(vectorDataFileName, state.context); + vectorIndex = state.directory.createOutput(indexDataFileName, state.context); + + CodecUtil.writeIndexHeader( + meta, + Lucene92HnswVectorsFormat.META_CODEC_NAME, + Lucene92HnswVectorsFormat.VERSION_CURRENT, + state.segmentInfo.getId(), + state.segmentSuffix); + CodecUtil.writeIndexHeader( + vectorData, + Lucene92HnswVectorsFormat.VECTOR_DATA_CODEC_NAME, + Lucene92HnswVectorsFormat.VERSION_CURRENT, + state.segmentInfo.getId(), + state.segmentSuffix); + CodecUtil.writeIndexHeader( + vectorIndex, + Lucene92HnswVectorsFormat.VECTOR_INDEX_CODEC_NAME, + Lucene92HnswVectorsFormat.VERSION_CURRENT, + state.segmentInfo.getId(), + state.segmentSuffix); + maxDoc = state.segmentInfo.maxDoc(); + success = true; + } finally { + if (success == false) { + IOUtils.closeWhileHandlingException(this); + } + } + } + + @Override + public void writeField(FieldInfo fieldInfo, KnnVectorsReader knnVectorsReader) + throws IOException { + long vectorDataOffset = vectorData.alignFilePointer(Float.BYTES); + VectorValues vectors = knnVectorsReader.getVectorValues(fieldInfo.name); + + IndexOutput tempVectorData = + segmentWriteState.directory.createTempOutput( + vectorData.getName(), "temp", segmentWriteState.context); + IndexInput vectorDataInput = null; + boolean success = false; + try { + // write the vector data to a temporary file + DocsWithFieldSet docsWithField = writeVectorData(tempVectorData, vectors); + CodecUtil.writeFooter(tempVectorData); + IOUtils.close(tempVectorData); + + // copy the temporary file vectors to the actual data file + vectorDataInput = + segmentWriteState.directory.openInput( + tempVectorData.getName(), segmentWriteState.context); + vectorData.copyBytes(vectorDataInput, vectorDataInput.length() - CodecUtil.footerLength()); + CodecUtil.retrieveChecksum(vectorDataInput); + long vectorDataLength = vectorData.getFilePointer() - vectorDataOffset; + + long vectorIndexOffset = vectorIndex.getFilePointer(); + // build the graph using the temporary vector data + // we pass null for ordToDoc mapping, for the graph construction doesn't need to know docIds + // TODO: separate random access vector values from DocIdSetIterator? + Lucene92HnswVectorsReader.OffHeapVectorValues offHeapVectors = + new Lucene92HnswVectorsReader.OffHeapVectorValues( + vectors.dimension(), docsWithField.cardinality(), null, null, vectorDataInput); + OnHeapHnswGraph graph = + offHeapVectors.size() == 0 + ? null + : writeGraph(offHeapVectors, fieldInfo.getVectorSimilarityFunction()); + long vectorIndexLength = vectorIndex.getFilePointer() - vectorIndexOffset; + writeMeta( + fieldInfo, + vectorDataOffset, + vectorDataLength, + vectorIndexOffset, + vectorIndexLength, + docsWithField, + graph); + success = true; + } finally { + IOUtils.close(vectorDataInput); + if (success) { + segmentWriteState.directory.deleteFile(tempVectorData.getName()); + } else { + IOUtils.closeWhileHandlingException(tempVectorData); + IOUtils.deleteFilesIgnoringExceptions( + segmentWriteState.directory, tempVectorData.getName()); + } + } + } + + /** + * Writes the vector values to the output and returns a set of documents that contains vectors. + */ + private static DocsWithFieldSet writeVectorData(IndexOutput output, VectorValues vectors) + throws IOException { + DocsWithFieldSet docsWithField = new DocsWithFieldSet(); + for (int docV = vectors.nextDoc(); docV != NO_MORE_DOCS; docV = vectors.nextDoc()) { + // write vector + BytesRef binaryValue = vectors.binaryValue(); + assert binaryValue.length == vectors.dimension() * Float.BYTES; + output.writeBytes(binaryValue.bytes, binaryValue.offset, binaryValue.length); + docsWithField.add(docV); + } + return docsWithField; + } + + private void writeMeta( + FieldInfo field, + long vectorDataOffset, + long vectorDataLength, + long vectorIndexOffset, + long vectorIndexLength, + DocsWithFieldSet docsWithField, + OnHeapHnswGraph graph) + throws IOException { + meta.writeInt(field.number); + meta.writeInt(field.getVectorSimilarityFunction().ordinal()); + meta.writeVLong(vectorDataOffset); + meta.writeVLong(vectorDataLength); + meta.writeVLong(vectorIndexOffset); + meta.writeVLong(vectorIndexLength); + meta.writeInt(field.getVectorDimension()); + + // write docIDs + int count = docsWithField.cardinality(); + meta.writeInt(count); + if (count == 0) { + meta.writeLong(-2); // docsWithFieldOffset + meta.writeLong(0L); // docsWithFieldLength + meta.writeShort((short) -1); // jumpTableEntryCount + meta.writeByte((byte) -1); // denseRankPower + } else if (count == maxDoc) { + meta.writeLong(-1); // docsWithFieldOffset + meta.writeLong(0L); // docsWithFieldLength + meta.writeShort((short) -1); // jumpTableEntryCount + meta.writeByte((byte) -1); // denseRankPower + } else { Review Comment: Indeed, we would probably need to use `DirectMonotonicReader::binarySearch` function to implement doc iteration. -- This is an automated message from the Apache Git Service. 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