Challenges

Fan-out on write or on read

X: home timeline

DifficultyStages: 0 / 4
  1. Gather on read
  2. Fan out on write
  3. Big accounts
  4. Timeline memory
  5. Final test

Build the home timeline of a social network. Gather it on read, then build it on write, then handle accounts with huge follower counts, and last fit the timelines in a memory budget.

Final testA big account posts at peak: big-account posts x3 and home reads x1.3 for 15 s. Your final board runs once more with a new traffic seed.

The system, stage by stageTap, drag or use arrow keys to step through the stages

Stage 4 of 4 · 5 parts given · 23,100 requests/s

Users 2API server 1

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