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* feat: feature-flagged segment manifest for LocalShard
Add an on-disk segment manifest (`segments/manifest.json`) that lists a
shard's segments and their state, so out-of-process readers (e.g. a
read-only follower, possibly over object storage) can discover segments
without scanning the filesystem. Gated by the new `write_segment_manifest`
feature flag (off by default).
shard: define the structure + helpers (`SegmentsManifest`,
`SegmentManifestState`, `from_segment_holder`) in a new `segment_manifest`
module, plus the `SEGMENT_MANIFEST_FILE` constant and path helper. The
manifest is a flat `{ "<uuid>": "<state>" }` map; only `active` is written
today, with `under_construction`/`retiring` defined so the format can be
extended without breaking compatibility.
collection: LocalShard owns the writing logic. The manifest is persisted
via `SaveOnDisk<SegmentsManifest>`, initialized from the live segment set
on load/build and refreshed by the optimization worker whenever the
segment set changes (the helper re-derives from the holder and no-ops when
unchanged). No changes to `lib/shard/src/optimize.rs` internals.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Emj8TFxdtrf3K32eWhGgor
* feat: make append_only_mutations a proper feature flag
Replace the debug-only `QDRANT_APPEND_ONLY_MUTATIONS=1` env-var escape
hatch in segment construction with a `FeatureFlags::append_only_mutations`
flag, so it works in release builds and is configurable like the other
flags (config / `QDRANT__FEATURE_FLAGS__APPEND_ONLY_MUTATIONS`).
Deliberately left out of `FeatureFlags::all()`: it changes mutation
semantics and `all` is enabled in dev and e2e configs, so it stays
explicit opt-in.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Emj8TFxdtrf3K32eWhGgor
* upd openapi schema
* feat: register segments in manifest via must-use token, holder builder
Wire segment-manifest maintenance through the segment lifecycle so a
newly created segment is registered as soon as it exists on disk, and
construction can't silently skip it:
- build_segment now returns a #[must_use] NewSegmentToken carrying the
new segment UUID; the lint forces callers to register or drop it.
- SegmentHolder owns the manifest and reconciles it on sync; new
segments are registered ASAP (even before being added to the holder)
via the token, before they can receive writes.
- SegmentHolderBuilder is the only way to obtain a shard's holder; its
build() wires up the manifest, so it can't be forgotten. init/set
manifest helpers are now private / test-only.
- Optimization registers the optimized segment before dropping the
superseded segments' data; deletion is intentionally lenient.
- Document the consistency assumptions on SegmentsManifest: it is a
superset-biased view that may list not-yet-finalized or already-deleted
segments, which readers must tolerate.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
---------
Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
