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I'm planning an upgrade for our newton based swift cluster (OOO vm 
based) to a (kolla image based containers) train cluster
So far I have tested the upgrade for the proxies, account_servers and 
container servers and it looks promising. I have in a test environment:

- switched to the new proxies with the old ring files and it looks like 
everything works normally
- Added the new (train) account and container servers to the rings and 
it looks like all is fine
- Removed the old account and container servers, still fine
- tested fall back, also fine

My question actually is: Did the account and container database format 
change between newton and train in such a way that I might run into 
troubles trying the upgrade as tested above in ways that I did not yet 
foresee?

Thanks

Marcel