mingmxu opened a new issue, #10965:
URL: https://github.com/apache/pinot/issues/10965

   `brokerId` is assigned as 
below:([code](https://github.com/apache/pinot/blob/24c5d8fe8521b91e68dd07294a3f57b067c0d525/pinot-broker/src/main/java/org/apache/pinot/broker/broker/helix/BaseBrokerStarter.java#L280))
   ```
   String brokerId = _brokerConf.getProperty(Broker.CONFIG_OF_BROKER_ID, 
getDefaultBrokerId());
   ``` 
   
   A valid value for `brokerId` is important in many components, for example 
it's required in v2 engine to guarantee an unique requestId. It's preferred to 
throw an exception to stop broker starter instead of return an empty string.
   ```
     private String getDefaultBrokerId() {
       try {
         return InetAddress.getLocalHost().getHostName();
       } catch (Exception e) {
         LOGGER.error("Caught exception while getting default broker Id", e);
         return "";
       }
     }
   ```
   
   cc @jackjlli 


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