Code Room
On-callHard
Question
Latency is spiking in a sawtooth pattern — periodic multi-second stalls every minute or so — on an otherwise healthy service. You suspect garbage-collection pauses. How do you confirm and mitigate?
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
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Run or narrate your approach, then ask the coach.