pan3793 commented on issue #4194:
URL: https://github.com/apache/kyuubi/issues/4194#issuecomment-1398229863

   > ...
   > Why it's needed - driver start takes about 20-30s and we want to keep it 
5-10 minutes in idle state to prevent this time overhead for kyuubi users in 
each separate request.
   
   Sorry, I'm not a native engine speaker and am not very clear w/ your origin 
question, for my understanding, I guess you may worry about one of the 
following ones
   
   1. the `spark-submit` take a long period and kyuubi will treat the launch 
operation as failed when the launching time reaches the threshold. In this 
case, you can enlarge `kyuubi.session.engine.initialize.timeout` whose default 
value is `PT3M`
   
   2. the `spark-submit` is a kind of heavy operation, and you want to keep the 
started engine alive for a period e.g(10min) even if it does not hold the 
active connection so that the following connection can reuse the engine. In 
this case, you can refer to my first reply to learn about "engine share level"


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