Hey Guys,

Suppose I have an Akka application which always keeps the state of all the 
actors in memory and commands are flowing through which are modifying the 
state of the Actors constantly and I want to upgrade my application code to 
a newer version. How do I do that without any downtime ? 

The problem I see if I fire up another machine (Machine_B) with newer 
version of the application, I will have to wait for the all the state of 
all the Actors to be initialized which might take time and while the new 
application is load, older Machine_A's application would've already 
processed more commands which might have modified the state of the Actors. 
What are the best practices to solve this problem ? 


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