Introduction You are netflix. Now your main servers are hosted in the USA, however, you have users all over the world. Now suppose, a user from India request a video (movie/TV etc.) that is hosted in a USA data center. To serve the request, you need to transmit data all across the world, which increases the users latency and makes up for a bad user experience. And if there are millions of users in India, requesting data from USA, then the network will become like red hot steel. ...
Introduction Firstly I would like to talk about the scale of twitter, which will help us to understand the requirements of a system like twitter. Twitter handles about 600 tweets per second. Which means that approximately 600 tweets are made each second. On the contrary, approximately 60,000 tweets are read each second. This clearly shows that twitter is a read heavy system. There are approximately 300 million users of twitter. Some of them are active users (users who frequently visit twitter), while most of them are passive users (i.e. users who’d only visit once in a while, say 1 month). ...