Jackie-Jiang commented on a change in pull request #5082: Plug in the new 
routing introduced in #5046
URL: https://github.com/apache/incubator-pinot/pull/5082#discussion_r382752023
 
 

 ##########
 File path: 
pinot-common/src/main/java/org/apache/pinot/common/messages/SegmentRefreshMessage.java
 ##########
 @@ -19,52 +19,60 @@
 package org.apache.pinot.common.messages;
 
 import java.util.UUID;
+import org.apache.helix.ZNRecord;
 import org.apache.helix.model.Message;
 
 
 /**
- * This (helix) message is sent from the controller to the server when a 
request is received to refresh
+ * This (Helix) message is sent from the controller to brokers and servers 
when a request is received to refresh
  * an existing segment.
  *
- * There is one mandatory field in the message -- the CRC of the new segment.
+ * NOTE: Changing this class to include new fields is a change in the 
protocol, so the new fields must be made optional,
+ * and coded in such a way that either controller, broker or server may be 
upgraded first.
 
 Review comment:
   Added

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