Medium-Hard Evaluate Back-of-Envelope Estimation Multiple Choice

Uber has 5M active drivers sending GPS every 4 seconds. Which technology is most appropriate as a write buffer before the location store?

Evaluate — Tests ability to make judgments and justify decisions.

Answer Options

A PostgreSQL with a write-ahead log

B A message queue like Kafka to buffer 1.25M writes/sec

C A single Redis instance

D An HTTP load balancer

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This question is from the Back-of-Envelope Estimation topic (System Design).

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