dcapwell commented on code in PR #3842:
URL: https://github.com/apache/cassandra/pull/3842#discussion_r1934269317


##########
src/java/org/apache/cassandra/service/accord/FetchTopology.java:
##########
@@ -123,18 +116,20 @@ public Response(long epoch, Topology topology)
         long epoch = message.payload.epoch;
         Topology topology = 
AccordService.instance().topology().maybeGlobalForEpoch(epoch);
         if (topology == null)
-            MessagingService.instance().respond(Response.UNKNOWN, message);
+            MessagingService.instance().respond(Response.unkonwn(epoch), 
message);

Review Comment:
   i couldn't find any tests for this logic.  Since this is a verb handle we 
should get back an `UNKNOWN` exception; that could be a NPE or an unknown 
epoch... its truly unknown.



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