عرض عملي: تعبئة رجعية يجب إيقافها واستئنافها

خطوة بخطوة

1. Start the backfill with checkpoints and a rate limit; show dashboards for source load.
2. Observe database latency rising during a business peak.
3. Lower the rate, then stop the job; confirm the checkpoint.
4. Planned mistake: restart from the beginning and duplicate rows. Fix: resume from the checkpoint; confirm idempotent upserts prevent duplicates.
5. Resume at a lower rate off-peak.
6. Verify with counts and checksums per key range, and write the result into the migration report.

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