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Resumption

What is resumption?

Resumption is continuing an interrupted job from its last checkpoint rather than restarting it. It requires the state to have been written durably and the job to know where it stopped.

It is what makes interruptible capacity usable. An interruption costs the time since the last checkpoint rather than the entire run.

It also has to be idempotent. A resume request that arrives twice must not start two continuations, which is the same problem retries create everywhere else.

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