mcvsubbu commented on a change in pull request #6250:
URL: https://github.com/apache/incubator-pinot/pull/6250#discussion_r520911431



##########
File path: 
pinot-broker/src/main/java/org/apache/pinot/broker/requesthandler/BaseBrokerRequestHandler.java
##########
@@ -436,6 +449,17 @@ public BrokerResponse handleRequest(JsonNode request, 
@Nullable RequesterIdentit
     return brokerResponse;
   }
 
+  private void validateNumSegments(Map<ServerInstance, List<String>> 
offlineRoutingTable,
+      Map<ServerInstance, List<String>> realtimeRoutingTable, int 
querySegmentLimit) {
+    int numOffline = offlineRoutingTable == null ? 0 : 
offlineRoutingTable.values().stream().mapToInt(List::size).sum();

Review comment:
       > Avoid using stream api for performance concern
   
   Agreed. Used to be that we had a class instead of a `Map<ServerInstance, 
List<String>>` for routing table? When the routing table is constructed, we can 
count the segments and keep it in the class (if we resurrect it), but I go back 
to my previous question about limiting the segments




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