Advanced Debugging and Root Cause Analysis Questions
Systematic approaches to complex debugging scenarios: intermittent failures, race conditions, environment-dependent issues, infrastructure problems. Using logs, metrics, and instrumentation effectively. Differentiating between automation issues, environment issues, and application defects. Experience with advanced debugging tools and techniques.
HardTechnical
24 practiced
You suspect a heisenbug caused by a race between two services that only manifests in production. Describe tools and approaches to debug such a heisenbug with minimal perturbation: low-overhead eBPF tracing, conditional tracepoints, record-and-replay strategies, targeted logging, and methods to prove causality. Include trade-offs for each technique.
EasyTechnical
21 practiced
Explain benefits of structured (JSON) logging over unstructured free-text logs for debugging and RCA. Provide examples of a minimal standardized log schema (timestamp, request_id, service, level, user_id(optional), context) and describe how to index and query those fields for efficient troubleshooting.
MediumTechnical
31 practiced
An automation script that applies database schema migrations sometimes leaves the schema partially applied when two pipelines run concurrently. How would you debug the automation failure and redesign the deployment process to be idempotent and safe for concurrent runs?
EasyTechnical
21 practiced
Explain the practical differences between an OOM (out-of-memory) kill and a memory leak. Which telemetry and logs (OOM killer logs, RSS, heap vs resident set, GC metrics, allocation rates) would you inspect to distinguish them and what time-series patterns indicate a leak versus a transient spike?
EasyTechnical
31 practiced
Explain how SLOs, SLAs, and an error budget affect how you prioritize debugging and remediation work. Given a service with a 99.9% monthly SLO and a current error budget burn of 70% in the last week, how would you adjust priorities between feature work, bug fixes, and operational mitigations?
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