Error type classification is lost when aggregating errors through string conversion

Summary#

When a batch aggregates typed errors by converting the first failure to a display string, the retryable/permanent distinction encoded in the original error type is destroyed. Recovery code that inspects the aggregated error then treats all failures as permanent, causing unnecessary aborts. Preserve the recorded classification of the batch through the aggregation boundary rather than re-deriving it from the stringified message.

Problem#

In rustfs cluster/bucket heal, a batch whose exhausted objects were all retryable could stop permanently because batch aggregation converted the first typed error to display text, stripping the retryable classification before recovery inspected it.

Solution#

Honor the batch's pre-recorded error classification for the aggregate task error so that faulty-drive and throttling errors remain retryable through the aggregation step.

Failure Modes#

Any error-wrapping boundary that calls .to_string() or format! before re-raising
Aggregators that pick a representative error by index without copying its type tag
Cross-process or cross-thread error channels that serialize errors as strings

Sources#

https://github.com/tensorflow/tensorflow/pull/127153
https://github.com/tensorflow/tensorflow/pull/126814
https://github.com/tensorflow/tensorflow/pull/127206
https://github.com/tensorflow/tensorflow/pull/127242
https://github.com/tensorflow/tensorflow/pull/126944
https://github.com/tensorflow/tensorflow/pull/127154
https://github.com/tensorflow/tensorflow/pull/126834
https://github.com/tensorflow/tensorflow/pull/127194
https://github.com/tensorflow/tensorflow/pull/127200
https://github.com/tensorflow/tensorflow/pull/127132
https://github.com/huggingface/transformers/pull/48429
https://github.com/huggingface/transformers/pull/48688
https://github.com/huggingface/transformers/pull/48515
https://github.com/huggingface/transformers/pull/48201
https://github.com/huggingface/transformers/pull/48589
https://github.com/huggingface/transformers/pull/48560
https://github.com/huggingface/transformers/pull/48640
https://github.com/huggingface/transformers/pull/48679
https://github.com/huggingface/transformers/pull/48653
https://github.com/huggingface/transformers/pull/48289
https://github.com/microsoft/ML-For-Beginners/pull/1002
https://github.com/microsoft/ML-For-Beginners/pull/1001
https://github.com/microsoft/ML-For-Beginners/pull/1000
https://github.com/ClickHouse/ClickHouse/pull/115383
https://github.com/ClickHouse/ClickHouse/pull/118672
https://github.com/ClickHouse/ClickHouse/pull/118014
https://github.com/ClickHouse/ClickHouse/pull/118286
https://github.com/ClickHouse/ClickHouse/pull/114777
https://github.com/ClickHouse/ClickHouse/pull/114562
https://github.com/ClickHouse/ClickHouse/pull/109620
https://github.com/ClickHouse/ClickHouse/pull/116614
https://github.com/ClickHouse/ClickHouse/pull/110536
https://github.com/ClickHouse/ClickHouse/pull/118071
https://github.com/ClickHouse/ClickHouse/pull/117358
https://github.com/rustfs/rustfs/pull/7654
https://github.com/rustfs/rustfs/pull/7647
https://github.com/rustfs/rustfs/pull/7652
https://github.com/rustfs/rustfs/pull/7653
https://github.com/rustfs/rustfs/pull/7623
https://github.com/rustfs/rustfs/pull/7635
https://github.com/rustfs/rustfs/pull/7648
https://github.com/rustfs/rustfs/pull/7644
https://github.com/rustfs/rustfs/pull/7642
https://github.com/rustfs/rustfs/pull/7645
https://github.com/rustfs/rustfs/pull/7639
https://github.com/rustfs/rustfs/pull/7643
https://github.com/rustfs/rustfs/pull/7636
https://github.com/rustfs/rustfs/pull/7640
mined_at: 2026-09-11T06:21:54Z

Sagwan Revalidation 2026-09-11T07:06:21Z#

verdict: ok
note: 에러 타입의 문자열 변환 시 분류 정보 소실이라는 원칙은 언어·런타임 무관한 불변 패턴으로 2026년에도 완전히 유효하다.

Sagwan Revalidation 2026-09-14T02:35:37Z#

verdict: ok
note: 에러 타입 정보가 문자열 변환으로 소실된다는 원칙은 언어·프레임워크 무관한 불변의 패턴이며, 2026년 기준에도 여전히 유효하다.