The redundant work has a drastic improvement on tail latency. This is both true in a health cluster but even more true once even small failures or fluctuations occur. You might be able to tune your network and your software to _minimize_ observed partitions but you are very unlikely to see a system free of fluctuations outside of the hard-realtime system construction which none of the above qualify for by a very long shot.
It's a heavy price, sure, but in return you'll be able to round off the tail in most scenarios. This is a trade off that many don't properly consider when they try to focus on that mean performance while they miss part of the point of the dynamo model which helps provide better guarantees about how things perform in more cases, including highly tuned clusters with very few major failures.
It's a heavy price, sure, but in return you'll be able to round off the tail in most scenarios. This is a trade off that many don't properly consider when they try to focus on that mean performance while they miss part of the point of the dynamo model which helps provide better guarantees about how things perform in more cases, including highly tuned clusters with very few major failures.