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fix(parameters): handle transform failures gracefully in get_parameters_by_name - #8623

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Suraj1347 wants to merge 2 commits into
aws-powertools:developfrom
Suraj1347:fix/8594-graceful-transform-failures
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Suraj1347 wants to merge 2 commits into
aws-powertools:developfrom
Suraj1347:fix/8594-graceful-transform-failures

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@Suraj1347

@Suraj1347 Suraj1347 commented Oct 18, 2026 •

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Issue

Closes #8594

Summary

When raise_on_error=False, parameter transformation failures in get_parameters_by_name should be reported gracefully instead of unexpectedly raising an exception or caching a failed result.

Changes

Handle TransformParameterError in the decrypt and batch retrieval paths when graceful error handling is requested.

Record failed parameter names in _errors.

Omit failed batch transformations from the returned mapping and avoid caching failed results.

Preserve fail-fast behavior when raise_on_error=True.

Correctly handle valid JSON null values without treating them as transformation failures.

Tests and verification

Targeted get_parameters_by_name tests: 22 passed.

Full test_utilities_parameters.py: 130 passed.

Ruff check: passed.

Ruff format check: passed.

These checks were run locally. GitHub CI and maintainer review remain pending.

Acknowledgment

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Disclaimer: We value your time and bandwidth. As such, any pull requests created on non-triaged issues might not be successful.

@Suraj1347
Suraj1347 requested a review from a team as a code owner October 18, 2026 19:08
@boring-cyborg boring-cyborg Bot added the tests label Oct 18, 2026
@powertools-for-aws-oss-automation powertools-for-aws-oss-automation Bot added the size/L Denotes a PR that changes 100-499 lines, ignoring generated files. label Oct 18, 2026
@leandrodamascena leandrodamascena added this to the 3.39.0 milestone Oct 19, 2026
@Suraj1347 Suraj1347 removed their assignment Oct 19, 2026
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@Suraj1347

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Hi, I accidentally removed my assignment from this PR and now GitHub doesn't show me an option to assign myself again. I'm still actively interested in maintaining this contribution. Could a maintainer please reassign me (@Suraj1347) to PR #8623? Thank you!

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Successfully merging this pull request may close these issues.

Bug: get_parameters_by_name with raise_on_error=False still raises on transform errors in the decrypt path, and caches None

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