Backfills
On This Lesson 4 topics
This lesson is planned. The outline below lists the topics it will cover. The full lesson has not been published yet.
In this lesson
copy large volumes of historical data safely.
Planned topics
- Throttle: limit rate so production is not hurt; make it adjustable at runtime.
- Idempotency: running a batch twice gives the same result; use upserts and stable keys.
- Resumability: checkpoint progress so you can stop and restart.
- Verification: row counts, checksums or sample comparisons; reconcile continuously with live writes.
- Plan the order and the handling of data that changes during the backfill.
Draft outline details
Demonstration
Backfill job outline: read batch by key range, transform, upsert, record checkpoint, sleep to meet the rate limit; verify with counts per range.
Check your understanding
Why must a backfill be idempotent?
Show answer
So retries and restarts do not duplicate or corrupt data.
Practice
Apply this lesson with the module's lab, exercises and quiz.
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