msokolov commented on code in PR #13581:
URL: https://github.com/apache/lucene/pull/13581#discussion_r1698956262


##########
lucene/core/src/java/org/apache/lucene/util/hnsw/HnswGraphBuilder.java:
##########
@@ -327,12 +331,14 @@ private void addDiverseNeighbors(int level, int node, 
NeighborArray candidates)
         continue;
       }
       int nbr = candidates.nodes()[i];
-      NeighborArray nbrsOfNbr = hnsw.getNeighbors(level, nbr);
-      nbrsOfNbr.rwlock.writeLock().lock();
-      try {
+      if (hnswLock != null) {
+        try (HnswLock.LockedRow rowLock = hnswLock.write(level, nbr)) {
+          NeighborArray nbrsOfNbr = rowLock.row;

Review Comment:
   I like the idea of more safety in the API to prevent accidentally 
circumventing the lock, but I'm not sure if I followed the idea completely. 
What would the Consumer do ?



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