exceptionfactory commented on PR #10599:
URL: https://github.com/apache/nifi/pull/10599#issuecomment-3612432435

   > @exceptionfactory
   > 
   > > implementation replaces the generic Serializer and Deserializer 
implementation, built on Java Object serialization.
   > 
   > Did you test, what happens after upgrading to the new format? I can't see 
any migration logic. Will the state be simply lost, or will it cause the 
processor to crash until the user clears the state?
   
   Yes, changing the format does result in exceptions on upgrade when there is 
existing state. This will require manual clearing of stored state in the 
associated cache server.


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