wForget commented on issue #1816:
URL: 
https://github.com/apache/incubator-kyuubi/issues/1816#issuecomment-1018232932


   > After we log our events to spark's event logger, they become raw JSON 
data, why do we need `ElementTrackingStore` here?
   
   The `ElementTrackingStore` is provided in the 
`org.apache.spark.sql.hive.thriftserver.ui.HiveThriftServer2HistoryServerPlugin#createListeners`
 method to initialize the SparkListener.
   
   Previously, EngineEvents were stored in 
`org.apache.kyuubi.engine.spark.events.EngineEventsStore`, after using 
`ElementTrackingStore`, it will be stored in 
`org.apache.spark.util.kvstore.InMemoryStore`.


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