Ngone51 commented on issue #25943: [WIP][SPARK-29261][SQL][CORE] Support 
recover live entities from KVStore for (SQL)AppStatusListener
URL: https://github.com/apache/spark/pull/25943#issuecomment-540647353
 
 
   @squito 
   
   > Sorry I am getting caught up on a lot of stuff here -- how is this related 
to #25577 ?
   
   This PR just extracts recovering live entities functionality from #25577.
   
   > Just for storing live entities, this approach seems more promising to me 
-- using Java serialization is really bad for compatibility, any changes to 
classes will break deserialization. If we want the snapshot / checkpoint files 
to be able to entirely replace the event log files, we'll need the 
compatibility.
   
   Hmm...This PR doesn't store live entities, instead, it recovers (or say, 
restore) live entities from a KVStore. For snapshot / checkpoint files, I think 
@HeartSaVioR has already posted a good solution in #25811, which has good 
compatibility for  serialization/de-serialization.

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