siddharthteotia commented on a change in pull request #6936:
URL: https://github.com/apache/incubator-pinot/pull/6936#discussion_r636631845



##########
File path: 
pinot-core/src/main/java/org/apache/pinot/core/transport/ServerResponse.java
##########
@@ -50,6 +51,14 @@ public int getSubmitDelayMs() {
     }
   }
 
+  public int getRequestSentDelayMs() {
+    if (_sendRequestTimeMs != 0) {
+      return (int) (_sendRequestTimeMs - _startTimeMs);
+    } else {
+      return -1;
+    }

Review comment:
       The following is correct for existing `getSubmitDelayMs()` API
   
   ```
   public int getSubmitDelayMs() {                          
     if (_submitRequestTimeMs != 0) {                       
       return (int) (_submitRequestTimeMs - _startTimeMs);  
     } else {                                               
       return -1;                                           
     }                                                      
   }  
   ```
   
   But what you are measuring is delay it took on the wire 
`getRequestSentDelayMs()`, so you should no rely on _startTime. Simply change 
the API to record the time
   
   
   ```
   void markRequestSent(ServerRoutingInstance serverRoutingInstance, long 
timeMs) {
       _responseMap.get(serverRoutingInstance).markRequestSent(timeMs);
     }
   ```




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