For a highly scalable distributed service that I'm building, I'm 
considering using event sourcing pattern. I'm planning to use Akka 
clustering with persistent actors for this application. I have a few 
questions related to event sourcing.

   - Are there scalability concerns with event sourcing, for e.g., when 
   there are several millions of events in the system ? Has anyone used event 
   sourcing in scale in production ?
   - What is the best way to handle schema changes in akka persistent actor 
   ?
   - In practice, what is the best way to handle data corruption ? Is it 
   through snapshots ?
   - What are the best practices to purge old events without impacting 
   recovery ?
   
Thanks in advance !
Sudhi.

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