jpountz commented on code in PR #14963:
URL: https://github.com/apache/lucene/pull/14963#discussion_r2248839514
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lucene/core/src/java/org/apache/lucene/codecs/lucene99/Lucene99HnswVectorsFormat.java:
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@@ -137,9 +144,16 @@ public final class Lucene99HnswVectorsFormat extends
KnnVectorsFormat {
private final int numMergeWorkers;
private final TaskExecutor mergeExec;
+ /**
+ * Whether to bypass HNSW graph building for tiny segments (below {@link
#HNSW_GRAPH_THRESHOLD}).
+ * When enabled, segments with fewer than the threshold number of vectors
will store only flat
+ * vectors, significantly improving indexing performance for workloads with
frequent flushes.
+ */
+ private final boolean bypassTinySegments;
Review Comment:
I'd like to have it at least as a parameter to a pkg-protected constructor,
so that we can pass random values in `TestLucene99HnswVectorsFormat` to make
sure that we exercise properly both the case when there is a graph and the case
when there is no graph.
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