navneet1v commented on code in PR #14178:
URL: https://github.com/apache/lucene/pull/14178#discussion_r1955514351


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lucene/sandbox/src/java22/org/apache/lucene/sandbox/codecs/faiss/FaissKnnVectorsFormat.java:
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@@ -0,0 +1,75 @@
+/*
+ * 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.lucene99.Lucene99FlatVectorsFormat;
+import org.apache.lucene.index.SegmentReadState;
+import org.apache.lucene.index.SegmentWriteState;
+
+public final class FaissKnnVectorsFormat extends KnnVectorsFormat {
+  public static final String NAME = 
FaissKnnVectorsFormat.class.getSimpleName();
+  static final int VERSION_START = 0;
+  static final int VERSION_CURRENT = VERSION_START;
+  static final String META_CODEC_NAME = NAME + "Meta";
+  static final String DATA_CODEC_NAME = NAME + "Data";
+  static final String META_EXTENSION = "faissm";
+  static final String DATA_EXTENSION = "faissd";
+
+  private final String description;
+  private final String indexParams;
+  private final KnnVectorsFormat rawVectorsFormat;
+
+  public FaissKnnVectorsFormat() {
+    this("HNSW32", "efConstruction=200");
+  }
+
+  public FaissKnnVectorsFormat(String description, String indexParams) {
+    super(NAME);
+    this.description = description;
+    this.indexParams = indexParams;
+    this.rawVectorsFormat =
+        new 
Lucene99FlatVectorsFormat(FlatVectorScorerUtil.getLucene99FlatVectorsScorer());

Review Comment:
   @kaivalnp 
   
   > In the ideal scenario we could use Faiss if the index stores full vectors 
(eg HNSWFlat), and only add raw vectors to Lucene for other indexes. For now I 
wasn't 100% sure on how to determine this, so I'm storing them in Lucene in all 
cases
   
   Ref `io_flag` argument to 
[write_index](https://github.com/facebookresearch/faiss/blob/main/faiss/impl/index_write.cpp#L391)
 function which gets called while writing the index in the file, which then can 
be used here: 
https://github.com/facebookresearch/faiss/blob/main/faiss/impl/index_write.cpp#L777-L779
 to skip writing the flatVector with Faiss.
   
   I myself have not explored it much to be really honest, but I was following 
up on this PR for some time. Here is the PR: 
https://github.com/facebookresearch/faiss/pull/3487 for more details. Just FYI 
I am not against having flatvectors in both faiss index and also in lucene. 
   
   



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