zhouyifan279 commented on issue #1293:
URL: 
https://github.com/apache/incubator-kyuubi/issues/1293#issuecomment-954497234


   The same error occurs if we mix use kyuubi.engine.pool.size as it also 
creates a child node under /kyuubi_{user}_{share_level}/.
   
   This error occurs occasionally as zookeeper stores child nodes  in a HashSet 
object and returns them in iteration order.
   So when we get hosts under `engineSpace`, the last host is not always the 
last created one.


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