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Reliable Atmos Pro Uploads for Large Repositories

· 2 min read
Erik Osterman
Erik Osterman
Founder @ Cloud Posse

Large infrastructure repositories can contain a few components with much larger settings than the rest. Grouping uploads by component count could still produce an oversized request and fail with HTTP 413. Atmos now sizes affected-stack and instances upload batches by their actual serialized bytes and recovers with smaller requests when the server rejects a batch.

The Problem​

An average component size cannot predict the size of a batch containing several large components. A rejected request could also return plain text, which appeared as an unexpected API response format instead of identifying the size limit.

The Fix​

The Atmos Pro upload configuration now defaults to a 3 MiB request budget, down from 4 MiB, leaving more room below the server limit. Uploads preserve component order and account for the request metadata as well as the component data.

If an affected-stack or instances upload receives HTTP 413, Atmos restarts the complete batch with a smaller budget, up to three times. A component that is too large even by itself produces an error naming its stack, component, and serialized size, with guidance to reduce the uploaded data. Small uploads keep their existing single-request behavior, and no server change is required for these two upload paths.

How to Use It​

Continue running affected-stack uploads or instances uploads as before:

atmos describe affected --upload
atmos list instances --upload

No configuration change is required. An explicit positive settings.pro.max_payload_bytes still controls the initial request budget; automatic recovery only reduces it for the current upload. Omitted or nonpositive values now select 3 MiB, regardless of an edition pin, because this is a runtime fallback rather than a stored configuration default.

The shared threshold also moves execution metadata to its existing out-of-band upload path sooner. Large execution-data objects still require the coordinated protocol work described in issue #3313; this release makes their HTTP 413 errors clear but does not add multipart object uploads.

Get Involved​

Report upload failures in GitHub issues, including the Atmos version and error message with sensitive data removed.