On-callMediumoc-p043

Subject CapacityLevel Mid–Senior~20 minCommon in Reliability & on-call interviewsIndustries Technology

Question

A heavy nightly batch job overran its window and is now running during peak traffic, contending for the database and degrading user-facing latency. What do you do?

What a strong answer looks like

Stop the bleeding first (mitigate), then form hypotheses from real signals. Separate root cause from symptom, communicate status as you go, and close with what prevents a repeat.

Learn the concepts

Diagram & narrate the incident

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Run or narrate your approach, then ask the coach.