One Bad Executor

A medium AI Coding interview practice problem on DataDriven. Write and execute real ai coding code with instant grading.

Domain

AI Coding

Difficulty

medium

Seniority

L5

Problem

On-call paged at 02:14 last night: the nightly orders enrichment job ran 3h 40m instead of its usual 22 minutes and one executor OOMed on stage 4. Cluster spend tripled. Volumes only grew about 8% week-over-week. The job lives in jobs/. Reproduce by running tests/test_skew_observability.py. Fix it so the test passes. Be ready to defend the trade-offs of your fix when the interviewer asks what happens with a different data shape.

Summary

One node held the whole night hostage.

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