turboFei edited a comment on issue #1754:
URL: 
https://github.com/apache/incubator-kyuubi/issues/1754#issuecomment-1085502551


   ## KVStore
   ```
   def get[T](key: String): T
   def set(key: String, value: Object): Unit
   def remove(key: String): Unit
   def keySet(): Seq[String]
   def count(): Int
   ```
   How to add index for the store?
   
   <img width="937" alt="image" 
src="https://user-images.githubusercontent.com/6757692/161211397-3102783e-9e10-4dc4-a85f-15b9e6473426.png";>
   
   ## Session/OperationManager recovery
   
   ```
   def init(conf: KyuubiConf): Unit = {
     // …
     store = …
     recover()
   }
   
   store.set(...)
   store.get(...)
   store.remove(...)
   
   // recover from the state store
   def recover(): Unit = {
      store.keySet().foreach(recoveryState)
   }
   
   ```
   
   ## Engine connection recovery
   - Kyuubi Engine SessionManager reserve the sessionHandle and SparkSession 
mapping
   - Support to recover the internal connection between kyuubi server and 
kyuubi engine
   


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