apucher commented on a change in pull request #6418:
URL: https://github.com/apache/incubator-pinot/pull/6418#discussion_r557829165



##########
File path: 
pinot-broker/src/main/java/org/apache/pinot/broker/broker/helix/HelixBrokerStarter.java
##########
@@ -117,13 +124,18 @@ public HelixBrokerStarter(PinotConfiguration brokerConf, 
String clusterName, Str
       brokerHost = 
_brokerConf.getProperty(CommonConstants.Helix.SET_INSTANCE_ID_TO_HOSTNAME_KEY, 
false) ? NetUtil
           .getHostnameOrAddress() : NetUtil.getHostAddress();
     }
+
     _brokerId = _brokerConf.getProperty(Helix.Instance.INSTANCE_ID_KEY,
-        Helix.PREFIX_OF_BROKER_INSTANCE + brokerHost + "_" + _brokerConf
-            .getProperty(Helix.KEY_OF_BROKER_QUERY_PORT, 
Helix.DEFAULT_BROKER_QUERY_PORT));
+        Helix.PREFIX_OF_BROKER_INSTANCE + brokerHost + "_" + inferPort());
 
     _brokerConf.addProperty(Broker.CONFIG_OF_BROKER_ID, _brokerId);
   }
 
+  private int inferPort() {
+    return 
Optional.ofNullable(_brokerConf.getProperty(Helix.KEY_OF_BROKER_QUERY_PORT)).map(Integer::parseInt)

Review comment:
       starting on DEFAULT_BROKER_QUERY_PORT is ensured by ListenerConfigUtil. 
Here, we merely need to figure out a port number to generate an instance id for 
Helix




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