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URL: http://github.com/serverless/serverless/pull/13146

/global-52276e82f63bb403.css" /> fix: improve error message for parallel stack deployments (#11649) by MUNJETIJAYANTHKRISHNA · Pull Request #13146 · serverless/serverless · GitHub
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fix: improve error message for parallel stack deployments (#11649)#13146

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MUNJETIJAYANTHKRISHNA wants to merge 1 commit intoserverless:mainfrom
MUNJETIJAYANTHKRISHNA:fix-parallel-deploy-error
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fix: improve error message for parallel stack deployments (#11649)#13146
MUNJETIJAYANTHKRISHNA wants to merge 1 commit intoserverless:mainfrom
MUNJETIJAYANTHKRISHNA:fix-parallel-deploy-error

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@MUNJETIJAYANTHKRISHNA
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Summary

This pull request improves the error message shown when a CloudFormation ChangeSet
cannot be created due to a mismatch with an existing template.

Previously, the error message was unclear. Now it provides a clear explanation that
the issue often occurs when multiple deployments run in parallel (for example,
in CI/CD pipelines or simultaneous PR merges).


Changes

  • Updated lib/plugins/aws/deploy/lib/create-stack.js to add a more descriptive error message.
  • Added guidance on how to avoid the issue (e.g., by ensuring one deployment at a time or using unique stack names).

Related Issue

Fixes #11649


Testing

  • Verified that the new message appears only when the specific CloudFormation error occurs.
  • No breaking changes were introduced.

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github-actions bot commented Oct 24, 2025

All contributors have signed the CLA ✍️ ✅
Posted by the CLA Assistant Lite bot.

@MUNJETIJAYANTHKRISHNA
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I have read the CLA Document and I hereby sign the CLA

@MUNJETIJAYANTHKRISHNA
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Hi @medikoo and maintainers ,

This PR improves the error message for parallel stack deployments (#11649) to help users quickly understand and fix the issue when multiple CI/CD pipelines run concurrently.

It’s a small, safe, and non-breaking change that enhances developer experience.

Thanks for reviewing!

@medikoo
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medikoo commented Oct 25, 2025

@MUNJETIJAYANTHKRISHNA I'm no longer involved into this project

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Successfully merging this pull request may close these issues.

Deploy crashes randomly - ChangeSet lambdas-dev-change-set cannot be created due to a mismatch with existing attribute Template

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