squito 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-540197120
   Sorry I am getting caught up on a lot of stuff here -- how is this related 
to https://github.com/apache/spark/pull/25577 ? 
   They seem to be two different approaches to the same problem (though 
https://github.com/apache/spark/pull/25577 does a little bit more than just 
what is here).  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.

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