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Back-of-Envelope Estimation — Series 2
Preview — 3 of 10 questions
50 million daily users make 20 requests each. Peak traffic is three times the daily average. Approximately what peak rate should be planned for?
A34,700 requests/s.
B3,000 requests/s.
C11,600 requests/s.
D1 billion requests/s.
10 million users send 40 messages/day, each 100 bytes. Three full copies are retained. Excluding metadata, what physical growth results?
A40 GB/day.
B120 GB/day.
C1.2 TB/day.
D400 GB/day.
A feed receives 1,000 posts/s. Each post is copied to 200 follower inboxes. Ignoring batching, how many inbox insertions/s does fan-out require?
A201,000 insertions/s.
B1,000 insertions/s.
C5 insertions/s.
D200,000 insertions/s.
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