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In Flink we have long supported cancel with savepoint, and recently in FLIP-34 we have implemented stop with savepoint, both could be mapped to automatically triggering a backup before killing/shutting down the database instance, and completely orthogonal with the fuzzy/sharp checkpoint process.

Conclusion

According To conclude, according to all above analogies, it's clear that we should always (automatically) do a checkpoint (with retained checkpoint configured) when stopping job, just like we (automatically) do a sharp checkpoint during database shutdown. And this is a necessary supplement to reinforce the job stop semantic.

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