rmuir commented on a change in pull request #315:
URL: https://github.com/apache/lucene/pull/315#discussion_r721419192



##########
File path: 
lucene/core/src/java/org/apache/lucene/codecs/lucene90/Lucene90HnswVectorsReader.java
##########
@@ -301,55 +349,62 @@ public KnnGraphValues getGraphValues(String field) throws 
IOException {
       throw new IllegalArgumentException("No such field '" + field + "'");
     }
     FieldEntry entry = fields.get(field);
-    if (entry != null && entry.indexDataLength > 0) {
+    if (entry != null && entry.graphIndexLength > 0) {
       return getGraphValues(entry);
     } else {
       return KnnGraphValues.EMPTY;
     }
   }
 
   private KnnGraphValues getGraphValues(FieldEntry entry) throws IOException {
+    if (entry.ordOffsetsByLevel == null) {
+      synchronized (entry) {

Review comment:
       I'm confused, why is it a problem to just load it once, up-front, in 
Lucene90HnswVectorsReader constructor? This should be only created once per 
IndexReader.




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