Not My Vbucket with 2 nodes and 1 replica

[daschl]

While implementing replica get and testing with the mock, I noticed an issue which comes up depending on the key. When configured with 2 nodes and 1 replica, I get NMVs for the active node both for upsert and get. See this simple example:

String id = "4c03805d-adc9-47a7-9014-bd94c693a2bb";
collection.upsert(id, "Hello, World!");
Thread.sleep(1000);
collection.get(id);

I am not sure what is causing this, but my code seems to work against a real cluster. Maybe it has something to do with how the mock handles its config/topo?