Designing Idempotent Backfill Checkpoints
Production backfills should be designed with interruption in mind. Network issues, locks, deployment pauses, and unexpectedly large ranges all happen in real operations. That is why the core design question is not only speed, but idempotent checkpoints.
Why checkpoints matter
- they show exactly how far the run progressed
- they avoid restarting from zero
- they make it easier to tune batch size and load
- they support safe pause-and-resume behavior
Questions to answer
- are batches split by key range or time range
- how do you detect records already processed
- can reruns overwrite safely without side effects
- how is checkpoint state stored and verified
Backfill success depends more on boundaries than on SQL syntax.
Conclusion
The best backfill is not the fastest backfill. It is the one that can stop and resume without changing the result.
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