test(mongo): add join-churn write-load test

HA
2mo ago
+478-0

socket.io-client test that drives high join/leave churn — each join triggers a Viewer insert + a LiveRoom $inc — to measure how join-ack latency degrades under MongoDB write pressure.

  • load-test/mongo-write-load.js — worker-pool join/leave churn; join-ack percentiles + joins/sec
  • load-test/results/MONGO-WRITE-LOAD.md — writes triggered, mongostat/serverStatus sampling

Authored by Claude (Anthropic) via Claude Code. Not executed against a live backend — results are placeholders, not fabricated.

Summary by cubic

Adds a Socket.IO load generator that drives high join/leave churn to measure how join-ack latency degrades under MongoDB write pressure. The test hasn't been run against a live backend, so results in the results doc are placeholders.

What the test does

  • Each join triggers a Viewer insert plus a LiveRoom $inc update, so churn sustains write-heavy load.
  • A worker pool runs connect → join → disconnect cycles and reports join-ack percentiles plus joins/sec.
  • MONGO-WRITE-LOAD.md documents the writes triggered per join, Mongo-side sampling commands, and interpretation guidance.