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hardDatabricksSnowflakeNetflix

You shipped a logic bug three months ago. How do you safely backfill and reprocess the affected data?

A backfill that double-counts or takes down the live pipeline is worse than the original bug. The signal is idempotent partition-scoped rewrites, isolating backfill compute from live runs, and validating before swapping.

Updated Aug 2026 · Grounded in real Applied AI Engineer interview loops and written to a senior-engineer editorial bar.

A backfill that double-counts or takes down the live pipeline is worse than the original bug. The signal is idempotent partition-scoped rewrites, isolating backfill compute from live runs, and validating before swapping.

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