rmuir commented on a change in pull request #315:
URL: https://github.com/apache/lucene/pull/315#discussion_r721421242



##########
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:
       > and for some of these times we don't need the graph data (e.g. if we 
just do CheckIndex).
   
   Wait, that's a different bug. We should open an issue for it. CheckIndex 
should be "checking" the vectors somehow (even if its just uselessly reading 
the bytes).
   
   As it documents: "As this tool checks every byte in the index, on a large 
index it can take quite a long time to run."




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