Because if you want to have reasonable availability and low latency you can't ju...

		numbsafari on July 8, 2013 \| parent \| context \| favorite \| on: The Architecture Twitter Uses to Deal with 150M Ac... Because if you want to have reasonable availability and low latency you can't just buy two "big" machines. Going with the incrementally sized approach gives you more flexibility to economically distribute the risk, in addition to the load.