jberragan commented on code in PR #93:
URL: 
https://github.com/apache/cassandra-analytics/pull/93#discussion_r1956258793


##########
cassandra-analytics-core/src/main/java/org/apache/cassandra/spark/data/CassandraDataLayer.java:
##########
@@ -338,11 +338,13 @@ else if (clearSnapshotStrategy.hasTTL())
     private CompletionStage<Map<String, AvailabilityHint>> 
createSnapshot(ClientConfig options, RingResponse ring)
     {
         Map<String, PartitionedDataLayer.AvailabilityHint> availabilityHints = 
new ConcurrentHashMap<>(ring.size());
+        Map<String, Boolean> uniqueInstances = new HashMap<>();

Review Comment:
   I would be tempted to add an option to the ClientConfig to enable disable 
the feature, something like `createSnapshotFilterUniqueInstances`. Default to 
`true` is fine.



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