Publish schema and mutation state atomically around background workers

Summary#

If background jobs can observe metadata while a multi-step change is in progress, exposing half-complete state is enough to corrupt data. Reorder the transition so dependent mutation metadata is registered before the new schema becomes visible, or make both steps part of one atomic publish point.

Problem#

A rename operation exposed updated in-memory metadata before the corresponding mutation/conversion state was registered, allowing concurrent merges to read the new name without the required rewrite plan.

Solution#

Ensure mutation or conversion bookkeeping is installed before publishing the new metadata snapshot, and add race-focused tests that exercise the background observer window.

Failure Modes#

Protecting one code path while other schema-change paths still publish partial state
Using locks that guard metadata writes but not background snapshot reads
Lacking deterministic or stress tests, so the race appears fixed but remains latent

Sources#

https://github.com/tensorflow/tensorflow/pull/122380
https://github.com/tensorflow/tensorflow/pull/122224
https://github.com/tensorflow/tensorflow/pull/112655
https://github.com/tensorflow/tensorflow/pull/122482
https://github.com/tensorflow/tensorflow/pull/122489
https://github.com/tensorflow/tensorflow/pull/122570
https://github.com/tensorflow/tensorflow/pull/122569
https://github.com/tensorflow/tensorflow/pull/118369
https://github.com/tensorflow/tensorflow/pull/122483
https://github.com/tensorflow/tensorflow/pull/122541
https://github.com/tensorflow/tensorflow/pull/121626
https://github.com/tensorflow/tensorflow/pull/122187
https://github.com/tensorflow/tensorflow/pull/122573
https://github.com/huggingface/transformers/pull/47044
https://github.com/huggingface/transformers/pull/47042
https://github.com/huggingface/transformers/pull/45630
https://github.com/huggingface/transformers/pull/47040
https://github.com/huggingface/transformers/pull/47041
https://github.com/huggingface/transformers/pull/46417
https://github.com/huggingface/transformers/pull/47005
https://github.com/huggingface/transformers/pull/46933
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/microsoft/ML-For-Beginners/pull/994
https://github.com/microsoft/ML-For-Beginners/pull/991
https://github.com/microsoft/ML-For-Beginners/pull/990
https://github.com/microsoft/ML-For-Beginners/pull/989
https://github.com/microsoft/ML-For-Beginners/pull/987
https://github.com/microsoft/ML-For-Beginners/pull/986
https://github.com/ClickHouse/ClickHouse/pull/109323
https://github.com/ClickHouse/ClickHouse/pull/103480
https://github.com/ClickHouse/ClickHouse/pull/108511
https://github.com/ClickHouse/ClickHouse/pull/109318
https://github.com/ClickHouse/ClickHouse/pull/104822
https://github.com/ClickHouse/ClickHouse/pull/109082
https://github.com/ClickHouse/ClickHouse/pull/109269
https://github.com/ClickHouse/ClickHouse/pull/99654
https://github.com/ClickHouse/ClickHouse/pull/109322
https://github.com/ClickHouse/ClickHouse/pull/109321
https://github.com/ClickHouse/ClickHouse/pull/109320
https://github.com/ClickHouse/ClickHouse/pull/109319
https://github.com/ClickHouse/ClickHouse/pull/109224
https://github.com/vercel/turborepo/pull/13229
https://github.com/vercel/turborepo/pull/13222
https://github.com/vercel/turborepo/pull/13221
https://github.com/vercel/turborepo/pull/13220
https://github.com/vercel/turborepo/pull/13219
https://github.com/vercel/turborepo/pull/13205
https://github.com/vercel/turborepo/pull/13218
https://github.com/vercel/turborepo/pull/13213
https://github.com/vercel/turborepo/pull/13212
https://github.com/vercel/turborepo/pull/13210
https://github.com/vercel/turborepo/pull/13208
https://github.com/vercel/turborepo/pull/13211
mined_at: 2026-07-03T18:03:48Z

Sagwan Revalidation 2026-07-03T18:42:15Z#

verdict: ok
note: 원칙·권장안은 여전히 유효하며 최신 동시성 관행과도 부합한다

Sagwan Revalidation 2026-07-04T22:52:25Z#

verdict: ok
note: 원자적 공개 원칙과 경합 테스트 권장은 여전히 유효하다.

Sagwan Revalidation 2026-07-06T05:25:11Z#

verdict: ok
note: 원자적 메타데이터 공개 원칙은 최신 practice와도 충돌하지 않는다.

Sagwan Revalidation 2026-07-07T10:52:24Z#

verdict: ok
note: 원자적 공개와 백그라운드 관찰 경합 방지 권장은 여전히 유효함

Sagwan Revalidation 2026-07-08T17:22:06Z#

verdict: ok
note: 원자적 공개와 레이스 테스트 권고는 여전히 최신 실무에 부합함

Sagwan Revalidation 2026-07-10T20:16:49Z#

verdict: ok
note: 원자적 공개와 race 테스트 권장은 여전히 유효한 동시성 practice다.

Sagwan Revalidation 2026-07-12T14:18:05Z#

verdict: ok
note: 원자적 메타데이터 공개 원칙은 최신 실무에도 유효함

Sagwan Revalidation 2026-07-14T10:51:07Z#

verdict: ok
note: [chatgpt 오류] The read operation timed out

Sagwan Revalidation 2026-07-16T11:06:43Z#

verdict: ok
note: 원자적 게시 원칙은 여전히 유효하며 최근 검증 이후 변경 징후 없음

Sagwan Revalidation 2026-07-18T12:28:31Z#

verdict: ok
note: 원자적 공개 권장안은 여전히 유효하며 최근 검증 뒤 변화 근거가 없음

Sagwan Revalidation 2026-07-20T13:44:46Z#

verdict: ok
note: 원자적 publish 원칙과 경합 테스트 권장은 여전히 유효하다.