gortiz commented on code in PR #14110:
URL: https://github.com/apache/pinot/pull/14110#discussion_r1808556078


##########
pinot-broker/src/main/java/org/apache/pinot/broker/broker/helix/BaseBrokerStarter.java:
##########
@@ -346,9 +352,38 @@ public void start()
       timeSeriesRequestHandler = new TimeSeriesRequestHandler(_brokerConf, 
brokerId, _routingManager,
           _accessControlFactory, _queryQuotaManager, tableCache, 
queryDispatcher);
     }
+
+    LOGGER.info("Initializing PinotFSFactory");
+    
PinotFSFactory.init(_brokerConf.subset(CommonConstants.Broker.PREFIX_OF_CONFIG_OF_PINOT_FS_FACTORY));
+
+    LOGGER.info("Initialize ResultStore");
+    PinotConfiguration resultStoreConfiguration =
+        
_brokerConf.subset(CommonConstants.CursorConfigs.PREFIX_OF_CONFIG_OF_RESULT_STORE);
+    try {
+      ResponseSerde responseSerde = 
ResponseSerdeService.getInstance().getResponseSerde(
+          
resultStoreConfiguration.getProperty(CommonConstants.CursorConfigs.RESULT_STORE_SERDE,
+              CommonConstants.CursorConfigs.DEFAULT_RESULT_SERDE));
+      
responseSerde.init(resultStoreConfiguration.subset(CommonConstants.CursorConfigs.RESULT_STORE_SERDE)
+          .subset(responseSerde.getType()));
+
+      String expirationTime = 
getConfig().getProperty(CommonConstants.CursorConfigs.RESULTS_EXPIRATION_INTERVAL,
+          CommonConstants.CursorConfigs.DEFAULT_RESULTS_EXPIRATION_INTERVAL);
+
+      _resultStore = (AbstractResponseStore) 
ResponseStoreService.getInstance().getResultStore(

Review Comment:
   This doesn't look pretty. Here we are effectibly enforcing that 
`ResponseStoreService.getInstance().getResultStore(whatever)` should always 
return an `AbstractResponseStore`. If that is the case we should change the 
`getResultStore` method to enforce that at compile time. Alternatively we could 
relax the requirements in this class to be able to work with a `ResponseStore` 
(the interface)



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