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Back-of-Envelope Estimation
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Using decimal units, 10 billion sessions each occupy 500 bytes. Ignore indexes and replication. How much raw storage is needed?
A5 PB.
B50 TB.
C5 TB.
D500 GB.
A request performs three sequential operations taking 1 ms, 9 ms and 150 ms. Ignoring all other work, what is its latency?
A150 ms.
B9 ms.
C160 ms.
D53.3 ms.
500 million users load a feed five times/day. Each load returns 20 tweets. Assuming uniform traffic, what is the average number of feed HTTP requests/s?
AAbout 5,800 requests/s.
BAbout 28,900 requests/s.
CAbout 578,700 requests/s.
DAbout 2.5 billion requests/s.
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