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chore: document reason and mitigation for cross region reference failure from response objects being too large #30115

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May 9, 2024
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chore: document reason and mitigation for cross region reference failure from response objects being too large #30115

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documentation
colifran May 8, 2024
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documentation
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fix adr link
colifran May 9, 2024
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Update packages/aws-cdk-lib/README.md
scanlonp May 9, 2024
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Merge branch 'main' into colifran/export-length
mergify[bot] May 9, 2024
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10 changes: 9 additions & 1 deletion packages/aws-cdk-lib/README.md
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Expand Up @@ -268,7 +268,15 @@ In order to mimic strong references, a Custom Resource is also created in the co
stack which marks the SSM parameters as being "imported". When a parameter has been successfully
imported, the producing stack cannot update the value.

See the [adr](https://github.com/aws/aws-cdk/blob/main/packages/@aws-cdk/core/adr/cross-region-stack-references)
> [!NOTE]
> As a consequence of this feature being built on a Custom Resource, we are restricted to a
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> CloudFormation response body size limitation of [4096 bytes](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/crpg-ref-responses.html).
> To prevent deployment errors related to the Custom Resource Provider response body being too
> large, we recommend limiting the use of nested stacks and minimizing the length of stack names.
> Doing this will prevent SSM parameter names from becoming too long which will reduce the size of the
> response body.

See the [adr](https://github.com/aws/aws-cdk/blob/main/packages/aws-cdk-lib/core/adr/cross-region-stack-references)
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for more details on this feature.

### Removing automatic cross-stack references
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