migration: add range version RPC handlers - #1088
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📝 WalkthroughWalkthrough移行データのエクスポート、インポート、ステージ済みデータの昇格を追加しました。ルート履歴参照、書き込みフェンス、ステージ可視性、S3補助キーのルーティング、MVCCスナップショットの移行状態保存も更新しました。 Changes移行データ経路とルーティング
Estimated code review effort: 5 (Critical) | ~120 minutes Merge Risk: 🟠 High · up to This PR exposes migration read and write operations without the existing privileged authentication and can bypass write-fence checks when S3 auxiliary keys are present, allowing unauthorized data access or writes during migration. These high-impact current-head risks should be fixed before merge. Sequence Diagram(s)sequenceDiagram
participant MigrationClient
participant Internal
participant RaftProposer
participant kvFSM
participant MVCCStore
MigrationClient->>Internal: ExportRangeVersions
Internal->>MVCCStore: ExportVersions
MVCCStore-->>Internal: ページとカーソル
Internal-->>MigrationClient: エクスポートページ
MigrationClient->>Internal: ImportRangeVersions または PromoteStagedVersions
Internal->>RaftProposer: 移行コマンドを提案
RaftProposer->>kvFSM: 移行opcodeを適用
kvFSM->>MVCCStore: ImportVersionsRaft または PromoteVersions
MVCCStore-->>kvFSM: 適用結果
kvFSM-->>Internal: 結果
Internal-->>MigrationClient: ACKまたは昇格結果
🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
✨ Finishing Touches 💡 1📝 Generate docstrings 💡
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Code Review
This pull request adds support for range migrations by implementing ExportRangeVersions and ImportRangeVersions on the internal gRPC server, alongside updating the distribution Route metadata to track migration states. Feedback focuses on adding a defensive check in ExportRangeVersions to prevent infinite loops when the cursor does not progress, and removing an unreachable nil guard on i.leader in verifyInternalLeader to comply with guidelines against dead defensive code, which also requires updating the corresponding unit tests to use a mock leader.
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@codex review Updated in 59a1672:
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@codex review Rebased onto the latest design/hotspot-split-m2-fence-drain head in fbd7f56 after #1087 advanced. The migration import/export fixes remain intact and now include the parent broad DEL_PREFIX fence fix. Validation:
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@codex review Updated in 0fe341d:
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@codex review Updated in 7d3b01c:
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@codex review Updated in e7f69ef:
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| func latestMVCCVersionAt(ctx context.Context, st store.MVCCStore, key []byte, ts uint64) (store.MVCCVersion, bool, error) { | ||
| result, err := st.ExportVersions(ctx, store.ExportVersionsOptions{ | ||
| StartKey: key, | ||
| EndKey: nextScanCursor(key), |
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When the backing store is Pebble, ExportVersions converts EndKey to encodeKey(EndKey, MaxUint64) (store/lsm_migration.go), and nextScanCursor(key) (key + 0x00) sorts before normal encoded versions of key because the timestamp suffix begins with ^commitTS. On a staged-visible route backed by Pebble, both the live and staged point exports therefore return no candidates for ordinary keys, so GetAt can incorrectly return ErrKeyNotFound even though the key exists. Use a true single-key upper bound/exact-key filter instead of the scan cursor here.
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| ts uint64, | ||
| reverse bool, | ||
| ) ([]*store.KVPair, error) { | ||
| live, err := collectLatestLogicalVersions(ctx, g.Store, start, end, start, end, ts, liveLogicalVersionKey) |
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For staged-visible routes, this call starts an export loop that runs until result.Done, and the caller only applies limit after collecting both the full live range and the full staged prefix into maps. A user scan such as ScanAt(..., limit=100) over a migrated production range can therefore read and retain every version in the route before returning one page, which is a large latency/memory regression versus the previous bounded store scan. Please stop the merge once enough ordered candidates are available or otherwise page the merge by the requested limit.
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@codex review Updated in ca1a050:
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| nextWindow := nextStagedVisibilityCandidateWindow(window) | ||
| if nextWindow == window { | ||
| return out, nil |
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For staged-visibility routes with more than 8192 visible logical keys, any caller asking for a limit above stagedVisibilityMaxCandidateWindow can get a truncated result. Once window reaches 8192, a full underlying scan with len(out) < limit falls into nextWindow == window and returns immediately, even though there may be more keys after the current candidate window. This makes large ScanAt/ReverseScanAt calls silently miss keys during staged cutover.
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| if routeStart != nil && bytes.Compare(routeKey, routeStart) < 0 { | ||
| return false | ||
| } | ||
| return routeEnd == nil || bytes.Compare(routeKey, routeEnd) < 0 |
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This decoded S3 predicate only treats nil as an unbounded route_end, unlike RouteKeyFilter and the route descriptor convention where nil or empty means +infinity. If an unbounded last route is passed as a non-nil empty byte slice, every decoded bucket route key compares greater than []byte{}, so bucket meta/generation exports for that route return no versions. Check len(routeEnd) == 0 here instead of only routeEnd == nil.
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| if err := proto.Unmarshal(data, req); err != nil { | ||
| return errors.WithStack(err) | ||
| } | ||
| result, err := f.store.ImportVersions(ctx, store.ImportVersionsOptions{ |
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In encrypted clusters where storage-envelope cutover is active but a replica's writer registration is not yet committed, this FSM-apply path calls store.ImportVersions, whose Pebble implementation uses the direct write/encryption gate (encryptForKey(..., true)). That can return ErrWriterNotRegistered while replaying the Raft entry and fail the import on that replica; migration imports need a raft-apply variant that uses the non-gated FSM path instead of the direct ImportVersions path.
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| if engineForGroup(g) == nil { | ||
| return s.localGetAt(ctx, g, key, ts) | ||
| return s.localGetAt(ctx, g, distribution.Route{}, key, ts) |
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When callers use the explicit-group path (for example RawGet/RawScanAt with group_id for SQS partitioned ownership), this passes a zero route into the local read path, so routeHasStagedVisibility is always false and imported staged versions are ignored after cutover. Those reads can return not found or stale live data even though normal GetAt/ScanAt for the same logical route would merge staged data; the explicit group path needs the staged route metadata or must fail closed while staged visibility is active.
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Addressed the staged-visibility migration review items. Changes:
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| if route, ok := s.engine.GetRoute(routeKey(key)); ok && route.GroupID == groupID { | ||
| return route, nil | ||
| } | ||
| if s.groupHasStagedVisibility(groupID) { |
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When an explicit-group RawGet arrives with a stale group_id after cutover (for example, the caller still targets the old source group while engine.GetRoute(key) now returns the target route with StagedVisibilityActive), this checks staged visibility on the requested group instead of the resolved route. If the old group has no staged route, the function falls through to fallback and reads the old group's live MVCC without the staged merge, serving stale pre-migration data instead of failing closed or rerouting.
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| if len(matched) > 0 { | ||
| return matched, true, nil | ||
| } | ||
| if s.groupHasStagedVisibility(groupID) { |
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For explicit-group RawScan, a stale proxy can still send the old source group_id after the current intersecting route has moved to the target with staged visibility. In that case matched is empty, this check only inspects the requested group, and the fallback scans the old group's local store, so range reads can miss staged target data instead of failing closed; fail when any intersecting current route is staged but not matched to the requested group.
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| for _, route := range c.engine.GetIntersectingRoutes(start, end) { | ||
| if route.State == distribution.RouteStateWriteFenced { | ||
| return errors.Wrapf(ErrRouteWriteFenced, "key %q route range [%q,%q)", key, start, end) |
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When a bucket's !s3route|... interval has been split into multiple catalog routes and a non-owner slice is write-fenced, this loop rejects bucket metadata and generation writes even though s3BucketAuxiliaryOwnerRouteFromRange routes them through only the first intersecting, still-active route. The matching FSM WriteFencedIntersects check and timestamp-floor loops have the same issue, so migrating an unrelated object slice can block all auxiliary writes for that bucket; resolve the selected auxiliary owner route first and enforce only its fence and floor.
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Addressed the latest S3 bucket auxiliary owner-route write-fence/floor findings and the Lua raw type cache bound finding.\n\nValidation:\n- go test ./kv -run 'TestFSM.*S3BucketAuxiliary|TestShardedCoordinator.*S3BucketAuxiliary' -count=1 -timeout=180s\n- go test ./adapter -run 'TestLua.*Type.*Cache|TestLuaNegativeTypeCache|TestLuaRawTypeAtStartCache' -count=1 -timeout=180s\n- go test ./kv -count=1 -timeout=240s\n- go test ./adapter -run 'TestLua|TestRedisLua' -count=1 -timeout=240s\n- go test ./... -run '^$' -count=1 -timeout=300s\n- golangci-lint run ./kv ./adapter --timeout=5m\n- git diff --check\n\n@codex review |
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Lines 1136 to 1137 in b16dd62
Reject raw writes applied on a former owner
When a stale coordinator sends a raw PUT or DEL to the source after cutover with ObservedRouteVersion == 0 (the normal raw path does not auto-pin a version), this branch skips the historical check, and the current-snapshot check only tests whether the route is WriteFenced; once the target route is Active, it never compares that route's GroupID with f.shardGroupID. The former source therefore accepts a new MVCC version that current readers route past, silently losing the acknowledged write. Raw applies need a current-owner check or a durable source-side cutover fence even for zero-version requests.
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Inline comments:
In `@kv/fsm.go`:
- Around line 1204-1206: Update the mutation loop around
verifyS3BucketAuxiliaryWriteFenceFromSnapshot so a checked auxiliary key with
nil error skips only that mutation and continues validating subsequent
mutations; return immediately only when the helper reports a non-nil error,
preserving WriteFence validation for later keys.
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📒 Files selected for processing (12)
adapter/internal.goadapter/internal_migration_test.goadapter/redis_lua_context.goadapter/redis_lua_negative_type_cache_test.gokv/fsm.gokv/fsm_abort_test.gokv/fsm_migration_fence_test.gokv/fsm_onephase_dedup_test.gokv/fsm_reserved_control_test.gokv/fsm_txn_test.gokv/sharded_coordinator.gokv/sharded_coordinator_del_prefix_test.go
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Addressed the filesystem migration export gap in 986823c. Changes:
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Addressed the write-fence validation continuation issue in da19644. Changes:
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Codex Review: Didn't find any major issues. 👍 Reviewed commit: ℹ️ About Codex in GitHubYour team has set up Codex to review pull requests in this repo. Reviews are triggered when you
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Codex Review: Didn't find any major issues. More of your lovely PRs please. Reviewed commit: ℹ️ About Codex in GitHubYour team has set up Codex to review pull requests in this repo. Reviews are triggered when you
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Handled the explicit-group reverse scan finding at head 30be14d. Reverse ScanAtWithReadFence with GroupID now uses the same explicit-group route resolver even when route bounds are absent, and ReverseScanGroupAt uses that path too, so staged visibility is preserved in both reverse entry points. Validation:
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| @@ -570,7 +797,7 @@ func (s *ShardStore) ScanKeysAtWithReadFence(ctx context.Context, start []byte, | |||
| return keysFromKVs(kvs), nil | |||
| } | |||
| if groupID != 0 { | |||
| return s.scanKeyRouteAtWithReadFence(ctx, distribution.Route{GroupID: groupID}, start, end, limit, ts, readRouteVersion) | |||
| return s.scanKeyRouteAtWithReadFence(ctx, distribution.Route{GroupID: groupID}, start, end, limit, ts, true, readRouteVersion) | |||
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When a forward RawScanAt sets both keys_only and group_id without route bounds, adapter/grpc.go selects this method, but this branch constructs a route containing only the group ID. It therefore lacks the migration job and staged-visibility metadata, causing staged-only keys to be omitted and stale source-group keys to remain visible after ownership moves. Resolve the catalog route through the same explicit-group path used by value and reverse scans before scanning keys.
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| states[jobID] = clonePromotionState(state) | ||
| return errors.WithStack(batch.Set(migrationPromoteMetaKeyBytes, encodeMigrationPromotionStates(states), nil)) |
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After a terminal split job is archived, both RetireMigration implementations remove its import acknowledgements and HLC floor but never remove the promotion-state entry stored here. On clusters performing repeated autosplits, the in-memory snapshot metadata and Pebble _migpromote map therefore grow monotonically; moreover, every later promotion chunk reads and re-encodes the entire accumulated Pebble map. Delete the selected job's promotion state as part of RetireMigration so completed jobs do not make subsequent migrations progressively more expensive.
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Fixed the bucket auxiliary route ownership and selected-owner export issues at 8fc01b3.
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| if !ok { | ||
| return false | ||
| } | ||
| if allowRawRouteMatch && rawRouteFilter(rawKey) { |
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When a previously split source route starts under !s3route| and extends through the physical !s3| namespace (for example, [!s3route|bucket-z, +∞)), a later right-hand split disables allowRawRouteMatch even though the moved interval owns the raw bucket key. A legacy auxiliary row for an earlier bucket whose virtual owner is outside this source is then rejected by both predicates: the raw match is suppressed and its selected owner is outside the moving slice. After cutover the raw-key fallback resolves to the target, but the row remains stranded on the old source, making that legacy metadata unavailable; retain raw matches whenever the physical key itself lies in the migrated interval, including mixed virtual/raw ranges.
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Summary
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新機能
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