benwtrent commented on code in PR #13355:
URL: https://github.com/apache/lucene/pull/13355#discussion_r1596942824
##########
lucene/core/src/java/org/apache/lucene/codecs/hnsw/DefaultFlatVectorScorer.java:
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@@ -101,7 +102,9 @@ private ByteScoringSupplier(
@Override
public RandomVectorScorer scorer(int ord) throws IOException {
- return new ByteVectorScorer(vectors2, vectors1.vectorValue(ord),
similarityFunction);
+ byte[] ba = vectors1.vectorValue(ord);
+ return new ByteVectorScorer(
+ vectors2, ArrayUtil.copyOfSubArray(ba, 0, ba.length),
similarityFunction);
Review Comment:
My concern is that now for every scorer, we are now creating a new array.
For example, in the HNSW graph builder, now instead of just creating a
couple of backing arrays per thread, we create and require GC to collect a new
one for every node added. This increases the garbage created by millions of
arrays.
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