benwtrent commented on code in PR #12660:
URL: https://github.com/apache/lucene/pull/12660#discussion_r1370034532
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lucene/core/src/java/org/apache/lucene/util/hnsw/NeighborArray.java:
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@@ -35,6 +38,9 @@ public class NeighborArray {
float[] score;
int[] node;
private int sortedNodeSize;
+ public final ReadWriteLock rwlock = new ReentrantReadWriteLock(true);
Review Comment:
We can make it a refactor later, but I am convinced we will want a separate
`*NeighborArray` class for concurrent vs. serial graph building. There is no
technical reason to slow down serial graph building and I think we can make
concurrent even nicer by freeing itself from having to even think about serial
graph building.
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