junkaixue commented on issue #2048:
URL: https://github.com/apache/helix/issues/2048#issuecomment-2278692201

   ZK guarantee the sequence of listener callback for a same connection 
session. But no guarantee for cross session calls. As you described, you would 
like to get sequential calls from different spectator which is almost 
impossible.
   
   The reason is when your spectator connects to ZK, they may connect to 
different quorum node / observers. 
   
   Let me know if you would like to have anything for Helix side can help.


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