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Lessons (4)

• Design a File Storage Service

  … On completion validate checksums, commit metadata, and emit a versioned change event. Concern Design choice --- --- Unstable large upload …

• Distributed Coordination: Consensus, Heartbeats and Gossip

  … leader agreement, heartbeats, gossip membership and checksums solve different failure questions](/img/system-design-l6/coordination.svg) Problem …

• Design a Polite Web Crawler

  … Workers fetch, checksum, parse, normalize links and enqueue unseen candidates. A Bloom filter cheaply says definitely unseen or …

• Comments & Formatting

  … exported functions Clarify a regex or formula // Luhn checksum, see https://… js / Converts an amount between currencies using …