Parikh is Facebook’s vice president of infrastructure engineering. He oversees the hardware and software that underpins the world’s most popular social network, and if that notification doesn’t appear within seconds, it’s his job to find out why. The trouble is that the Facebook infrastructure now spans four data centers in four separate parts of the world, tens of thousands of computer servers, and more software tools than you could list without taking a deep breath in the middle of it all. The cause of that missing notification is buried somewhere inside one of the largest operations on the net.
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