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docs: record access tiering introduction and retirement decisions

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Signed-off-by: Feng Ruohang <rh@vonng.com>
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Feng Ruohang
2026-09-15 11:26:45 +08:00
parent 13bf126ebd
commit 4093fa0d78
3 changed files with 128 additions and 4 deletions
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CHANGELOG.md
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@@ -24,9 +24,13 @@ and [complete commit range](https://github.com/pgsty/silo/compare/RELEASE.2026-0
- Reconcile ordinary single-object version DELETE across all pools, including
null versions, delete markers and unqualified directory-marker DELETE. This
prevents movement leftovers from surviving a successful response. Unreadable
applies the deletion to every resolved pool copy under existing quorum
rules. Pending outbound delete replication retains versions until the
existing replication worker completes their purge; a successful response
does not imply immediate physical removal from every drive. Unreadable
pools now consistently return 503 instead of depending on pool traversal
order; this extends the existing failure surface. Retry after recovery.
order; insufficient read quorum returns `SlowDownRead`. This extends the
existing failure surface. Retry after recovery.
Cleanup failures also return an error. Batch deletion already fans out across
pools; replication and scanner cleanup keep their existing contracts. See
[scope and limitations](docs/bucket/lifecycle/access-tiering-removal.md#version-deletion-scope).
@@ -35,6 +39,8 @@ and [complete commit range](https://github.com/pgsty/silo/compare/RELEASE.2026-0
its tracker, mover, scanner hooks, configuration, XML actions and metrics.
Accept and ignore retired configuration/XML and preserve ordinary statistics
when reading v9 caches. See [migration notes](docs/bucket/lifecycle/access-tiering-removal.md).
The [decision record](docs/investigations/access-tiering-revert.md) preserves
the feature's introduction, subsequent fixes, rollback scope and review history.
- Preserve the independent multi-pool write, metadata, healing and conditional
deletion fixes from PR #178, including shared remote-tier reference protection.
- Enforce `If-Match` on DELETE, preserve retention and independently ordered