Explain owning and debugging infra modules

Describe a time you were responsible for a storage/distributed-systems/infra component (or a similarly low-level, reliability-critical module).

The interviewer will probe beyond concepts into implementation details. Address:

• What was the component and its role in the system (data path vs metadata path)?
• What reliability/performance goals existed (SLO/SLA, durability, p99 latency)?
• A specific incident or hard problem you faced (e.g., data inconsistency, corruption risk, replication lag, deadlock, performance regression).
• How you debugged it (signals, logs/metrics/traces, reproduction, hypothesis testing).
• What trade-offs you made and why.
• How you drove the fix to completion (testing, rollout, backfill/repair, postmortem, prevention).

If you have limited direct storage experience, you may use an adjacent example (caching layer, messaging system, concurrency-heavy service), but be explicit about what was similar/different.