jasonstack commented on code in PR #2769:
URL: https://github.com/apache/cassandra/pull/2769#discussion_r1361430967


##########
src/java/org/apache/cassandra/index/sai/StorageAttachedIndexGroup.java:
##########
@@ -75,10 +75,12 @@ public class StorageAttachedIndexGroup implements 
Index.Group, INotificationCons
 {
     private static final Logger logger = 
LoggerFactory.getLogger(StorageAttachedIndexGroup.class);
 
+    public static final Index.Group.Key GROUP_KEY = new 
Index.Group.Key(StorageAttachedIndexGroup.class);
+
     private final TableQueryMetrics queryMetrics;
     private final TableStateMetrics stateMetrics;
     private final IndexGroupMetrics groupMetrics;
-    private final Set<StorageAttachedIndex> indexes = 
Sets.newConcurrentHashSet();
+    private final Set<StorageAttachedIndex> indexes = 
ConcurrentHashMap.newKeySet();

Review Comment:
   it could be creating new index while iterating current index list for 
notifications



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