jiajunwang commented on pull request #1460:
URL: https://github.com/apache/helix/pull/1460#issuecomment-708092867


   Hold on, please.
   
   I'm trying to understand why the Exception is an issue here. If the reply 
message is stale, meaning we don't have enough information to handle it, fail 
the handler creation op seems to be a reasonable solution.
   
   If the operation is not failed out, then the handling will be finished with 
a successful result. It could be misleading.
   
   This basically means bad clients can send an invalid message response to the 
host and DDoS it. Since the host cannot reject any messages, it will allocate 
many resources. And this is concerning.
   
   


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