Linux Advanced About 40 min +330 XP

Exchange Gateway Throttling a Flood of Child Orders

The process list shows one order-router process near 98% CPU while the other seven sit between 2% and 5%.

Briefing

Kestrel Markets opened its new retail liquidity routing program at 09:00, and by 09:02 the exchange gateway was throttling the router fleet's shared session for sending far more child orders than any parent order needed.

All eight order routers pass their health checks and the rollout checklist says release 5.8.0 reached every node earlier this week, so Ravi wants to roll the whole fleet back to the build that ran quietly for three months.

Inspired by a real outage: In the Matter of Knight Capital Americas LLC (Knight Capital, 2012). Names and details are fictionalized.

The fix is yours to find: hints, the recovery checks and the debrief unlock inside the incident.

How it plays

  1. 01

    Get paged

    The alert fires and the clock starts. Read the page and the briefing.

  2. 02

    Investigate

    Work in a simulated shell with realistic output: logs, configs, services.

  3. 03

    Fix it

    Change the system the way you would in production. Hints are there if you get stuck.

  4. 04

    Prove it

    Automated checks verify the recovery, then the debrief explains what happened.

Your pager is ready.

Free, instant, and it works on your phone. No signup: start as a guest and save your progress later.