timothy65535 commented on issue #962:
URL: 
https://github.com/apache/incubator-kyuubi/issues/962#issuecomment-902405801


   @yaooqinn, it is still inconvenient to use 石墨.
   
   ### 1. Things to consider
   
   - Which share level to provide the engine pool?
   - How to control the concurrent create the engine?
   - How to share the pool size over two more kyuubi server?
   - Selection strategy(sequentially / randomly / load-based)?
   
   `engine pool` is design for `USER` share level, we can set the pool size as 
the content of namespace znode.
   
   ### 2. Work Flow
   
   
![image](https://user-images.githubusercontent.com/86483005/130174872-3cd1c8f5-dd50-4199-afbd-1347ce48f7e6.png)
   
   ### 3. How to update pool size
   
   
![image](https://user-images.githubusercontent.com/86483005/130175178-01f9c408-dacd-4e15-9bba-c20e53b76408.png)
   
   
   
   


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