mason: add --min-instances to mason deploy for manual horizontal scaling - #511
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mason: add --min-instances to mason deploy for manual horizontal scaling#511elainewang-db wants to merge 1 commit into
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…aling Wires `--min-instances` through to Databricks Apps compute scaling. Apps doesn't autoscale yet, so a fixed replica count is set by pinning compute_min_instances == compute_max_instances (the API rejects setting one bound alone). Instance count is create-only: `apps create` sets it, and re-deploying an existing app only proceeds when the requested count matches the running one — otherwise it fails with a clear "delete and recreate to re-scale" message rather than a doomed update-API call. Verified e2e on e2-dogfood: create at 2 instances (app RUNNING, min==max==2), matching-count re-deploy is a no-op, and a mismatched re-scale is rejected before any deploy. Co-authored-by: Isaac <no-reply@databricks.com>
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Wires
--min-instancesthrough todatabricks appscompute scaling: passed toapps createfor a new app, and applied viaapps updatebefore re-deploying an existing app's source (scaling isn't settable onapps deploy). Apps doesn't autoscale yet, so this is a fixed instance count.