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Idea #21997
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Option to fall back from spot instance to on demand if certain conditions are met
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Description
Sometimes spot instances are not available, but we don't want to sacrifice turnaround time by waiting excessively long time for spot instance price/availability to come down. In that case, the user would like fall back on requesting a regular on demand instance.
Consider how the user should request this behavior (this should probably be controllable per-workflow), and what conditions Arvados decides to fall back to on demand.
Thought: could be done by adding on demand instances to the list of candidate instance types after trying all the spot instance types.
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