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Acts on docs/design/2026_08_29_proposed_tso_batch_slot_claims.md, whose purpose was to get a tradeoff decided. The decision: Phase D stays batched. §3.1 (batch size 1) would put a Raft round trip on every Next(), which CLAUDE.md names as the invariant batching exists to preserve, and it buys a window that narrows rather than closes. §3.2 remains the fix and needs its own proposal, because a claim record is a wire/on-disk decision. Two decision-independent pieces land here. §3.3 for Internal.Forward. It was the only forward outside adminTokenProtectedMethod while ForwardAdminProposal and ForwardLeaseRead were both inside it, so it was the cheapest route to the durable-timestamp validation path for anything with peer-port reach. Both halves ship together: the server gate, and the peer token on the outbound write forward -- protecting the method without attaching the credential would have broken every forwarded write instead of authenticating it. An empty token attaches nothing and disables enforcement, so an unconfigured cluster behaves exactly as before on both ends. The §6 invariants that hold whichever option eventually lands: issuance is unique across concurrent allocators, direct and batched, and strictly monotonic. OCC's conflict check is latestTS(key) > startTS, so two commits sharing a timestamp can each read the other as not-newer -- uniqueness is load-bearing, and it has to survive whatever the slot-claim work changes about validation. Deliberately not added: a test that an unclaimed slot inside a committed window is refused. It is not refused today; that is the hole, and asserting current behaviour would lock in the bug. RelayPublish, ExportRangeVersions, ImportRangeVersions and PromoteStagedVersions stay outside the gate for now: each needs the same two-sided treatment and their clients are built through the migration factory rather than here, so they are tracked rather than half-wired. Claude-Session: https://claude.ai/code/session_013rNHooj7NF3giihWVba8QE
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TSOスロット請求の不変条件
Priority: ⬇️ Low Estimated code review effort: 3 (Moderate) | ~20 minutes Change: Bug fix Merge Risk: 🟡 Moderate · up to Configured peer forwarding now sends an admin bearer token without transport encryption. Protect peer traffic with verified TLS or avoid sending credentials over plaintext before merging. 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
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| end := fsm.AllocationFloor() | ||
| require.GreaterOrEqual(t, end, issued) | ||
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| require.Error(t, alloc.ValidateDurableTimestamp(ctx, end+1), |
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The fixture never activates Phase D: alloc.Next only reserves a normal window, so ValidateDurableTimestamp returns ErrTSOPhaseDInactive before evaluating timestamp > AllocationFloor(). Consequently this assertion still passes if the actual upper-bound validation is removed, leaving the stated invariant untested; activate Phase D first and assert the expected invalid-timestamp error.
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| §3.2 remains the fix and needs its own proposal, because the claim record is a | ||
| wire/on-disk decision (§5 questions 2 and 3). | ||
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| Landed now, both decision-independent: |
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This section explicitly records §3.3 and the invariant tests as landed while §3.2 remains outstanding, so retaining both the _proposed_ filename and Status: Proposed misclassifies the document's implementation state. Rename it to _partial_ and update the header now that the first milestones have shipped, as required by the repository's design-document lifecycle.
AGENTS.md reference: AGENTS.md:L98-L102
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| **Phase D stays batched.** §3.1 is rejected as an interim: `CLAUDE.md` states | ||
| that no Raft round trip per `Next()` is a design invariant — it is what batching | ||
| exists for — and §3.1 would violate it on exactly the Phase-D path. Trading a | ||
| throughput regression for a window that narrows but does not close is not worth | ||
| that. |
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The new decision definitively rejects §3.1 and says Phase D stays batched, but §5 question 1 still asks whether Phase D should stay batched or use per-timestamp round trips. Leaving the decided choice under “Open questions” makes the document internally contradictory for the follow-up claim proposal; mark that question resolved or remove it.
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| // only forward left outside this gate while its two siblings were | ||
| // inside it, which made it the cheapest way to that path for anything | ||
| // with peer-port reach. | ||
| fullMethod == pb.Internal_Forward_FullMethodName |
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During a rolling upgrade of a token-configured cluster, an old follower does not attach the newly added header, while an upgraded node immediately requires it whenever that node is the group leader. Every write entering such an old follower and forwarding to the upgraded leader therefore fails with Unauthenticated until the follower is upgraded or leadership moves; shipping both halves in one binary does not address cross-node version skew, so enforcement needs a capability/full-rollout activation gate or an explicit safe rollout mechanism.
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| t.Parallel() | ||
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| alloc, _ := newSlotClaimTSOFixture(t) | ||
| batch, err := NewBatchAllocator(alloc, 16) |
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The Phase-D uniqueness test creates only one BatchAllocator and sends every goroutine through it. That allocator's refill mutex serializes all window reservations, so the test covers concurrent claims inside one local window but cannot detect overlapping windows returned to separate node-local batch allocators, which is the cross-allocator property the document and PR claim to pin; issue concurrently through several BatchAllocator instances backed by the shared TSO service/state and merge their results.
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Actionable comments posted: 4
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Inline comments:
In `@docs/design/2026_08_29_proposed_tso_batch_slot_claims.md`:
- Around line 110-117: Update the §1 Exposure description to explicitly identify
the unauthenticated Internal.Forward state as pre-introduction or rewrite it in
the past tense, consistent with the implemented server gate and outbound
forwarding token described in §4a.
In `@kv/leader_proxy.go`:
- Line 265: Update LeaderProxy.forward so the bearer token is added only when
the peer connection uses TLS with certificate verification; otherwise omit the
authorization metadata for insecure connections. Preserve token forwarding for
authenticated TLS connections and align the check with GRPCConnCache.ConnFor and
its dial credentials.
In `@kv/tso_slot_claim_test.go`:
- Line 119: Extend the BatchAllocator test around batch.Next to verify strict
monotonicity, not only uniqueness: call BatchAllocator.Next sequentially using a
fresh fixture and assert each returned value is greater than the immediately
preceding value.
- Around line 67-69: Update both test sites in kv/tso_slot_claim_test.go at
lines 67-69 and 120-122: in the tests around Next, collect allocator errors
instead of continuing past them, then after waiting assert that no errors
occurred and that exactly goroutines * perWorker timestamps were issued.
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adapter/admin_grpc.goadapter/admin_grpc_test.godocs/design/2026_08_29_proposed_tso_batch_slot_claims.mdkv/leader_proxy.gokv/sharded_coordinator.gokv/sharded_coordinator_leader_test.gokv/tso_slot_claim_test.go
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| // enforcement for an empty token -- an unconfigured cluster behaves | ||
| // exactly as before, on both ends. | ||
| if token := p.group.peerForwardToken(); token != "" { | ||
| ctx = metadata.AppendToOutgoingContext(ctx, "authorization", "Bearer "+token) |
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🔒 Security & Privacy | 🛡️ Analyzed with Security Review | 🟠 Major | ⚡ Quick win
🧩 Analysis chain
🏁 Script executed:
#!/bin/bash
set -eu
printf '%s\n' '--- ConnFor and GRPCDialOptions definitions ---'
rg -n -C 8 'func .*ConnFor|type GRPCConnCache|GRPCDialOptions|insecure\.NewCredentials|credentials\.NewTLS|NewClientTLSFromFile|TransportCredentials' --glob '*.go' .Repository: bootjp/elastickv
Length of output: 50372
🏁 Script executed:
#!/bin/bash
set -eu
printf '%s\n' '--- exact production symbols ---'
rg -n -C 12 'GRPCConnCache|func \(.*\) ConnFor|func GRPCDialOptions|insecure\.NewCredentials|credentials\.NewTLS' kv internal --glob '*.go' || trueRepository: bootjp/elastickv
Length of output: 37148
Sensitive Data Exposure
Reachability: Internal
Exploitability: Moderate
CWE: CWE-319 — Cleartext Transmission of Sensitive Information
TLS なしの peer 接続で bearer token を送信しないでください。
LeaderProxy.forward は peerForwardToken が設定されている場合に authorization: Bearer ... を付加します。GRPCConnCache.ConnFor は internalutil.GRPCDialOptions() の insecure.NewCredentials() を使用するため、token が平文で送信されます。TLS（証明書検証付き）を必須にするか、平文接続では token を送信しないでください。
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In `@kv/leader_proxy.go` at line 265, Update LeaderProxy.forward so the bearer
token is added only when the peer connection uses TLS with certificate
verification; otherwise omit the authorization metadata for insecure
connections. Preserve token forwarding for authenticated TLS connections and
align the check with GRPCConnCache.ConnFor and its dial credentials.
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Four of the five review findings were the same defect in different places: the tests asserted properties they could not actually observe. The allocation-floor test never reached the bound. ValidateDurableTimestamp refuses an inactive Phase D first, so on an unactivated fixture every timestamp was refused for the wrong reason and the assertion held with the bound deleted. It now activates Phase D, asserts a timestamp inside the committed window validates -- which is what makes the two refusals about the bound rather than the state -- and pins ErrTSOTimestampInvalid rather than any error at all. Both concurrency tests discarded allocator errors with a bare continue. Uniqueness over whatever happened to succeed is satisfied by a single timestamp, so a fixture failing almost every call still looked like a passing property. They now collect the errors, require none, and require exactly goroutines*perWorker issued values. The batched test drove eight goroutines through one BatchAllocator, whose refill mutex serialises every reservation and makes the interesting failure -- two node-local allocators handed overlapping windows -- unreachable. It now runs one allocator per goroutine over shared TSO state, which is the shape production has. Uniqueness alone accepts a window handed out backwards, so the batched path gets the ordering half too. Verified: reversing tryWindowAfter leaves the uniqueness test passing and fails the new monotonic one. Worth recording for whoever changes reservation next: uniqueness is guarded twice, by the allocator's reservation mutex and by the HLC's CAS. Removing either alone leaves every test passing; both had to go before the multi-allocator test failed, and even then it caught it 3 runs in 6. Also documents the two properties of the Internal.Forward gate that review surfaced and that are not visible from the code: a node on an older binary does not attach the header, so every node must be upgraded before the gate can be relied on; and the token crosses the peer network in cleartext, because no peer dial in this process can be TLS. The gate is a barrier against reaching the peer port, not against observing it -- withholding the token on an insecure connection would disable it everywhere rather than harden it, so confidentiality is left to peer mTLS. Claude-Session: https://claude.ai/code/session_013rNHooj7NF3giihWVba8QE
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9 件すべて確認しました。テスト系 4 件はいずれも「主張している性質を実際には観測していない」という同じ欠陥で、指摘どおりです。 1. allocation floor の上限テスト (codex P2) — 指摘の機構が正確でした。 2. 並行テストのエラー握りつぶし (coderabbit) — 指摘どおりです。 3. BatchAllocator を複数にする (codex P2) — 指摘どおりです。単一 allocator では refill mutex が全予約を直列化するため、「複数のノードローカル allocator に重なった窓が渡る」という当該の失敗に到達できません。goroutine ごとに ただし正直に付記すると、この性質は二重に守られています。allocator 側の予約 mutex と HLC の CAS の両方です。片方だけ壊しても全テストが通り、両方壊して初めて multi-allocator テストが落ちました（6 回中 3 回）。単一 allocator 版より厳密に強いものの、単独の revert-check で落とせる性質ではありません。 4. BatchAllocator の厳密単調性 (coderabbit) — 指摘どおりです。 5. design doc のライフサイクル (codex P2 / P3, coderabbit) — 3 件とも対応しました。 6. ローリングアップグレード時のスキュー (codex P1) — 機構は正確です。admin token 設定済みクラスタでは、旧バイナリの follower はヘッダを付けないため、アップグレード済みノードがリーダーのとき当該 follower 経由の書き込みが 現状のまま出し、手順を明記する方針としました。理由は、これが 7. 平文での bearer token 送信 (coderabbit Major / CWE-319) — 機構は正確です。ただし提案された対策は採用しません。
また、トークンの隣を流れる Raft トラフィック自体が同じく平文であり、当該ネットワーク上の観測者はすでにそれを読み書きできます。つまりこのゲートが上げているのは「peer ポートに到達する」ハードルであって「観測する」ハードルではなく、それは §1 の exposure（durable-timestamp 検証パスへの未認証の到達）の正しい読み方でもあります。同じパターンは 機密性は peer mTLS で解くべきもので、別 PR として切り出します。この判断と根拠は 検証: |
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@claude review |
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Claude finished @bootjp's task in 1m 46s —— View job Review
Scope reviewed: current HEAD ( Previously-raised findings — verified resolvedAll nine items the author replied to are genuinely fixed in
New findingStale filename references from the design-doc rename. The doc was correctly
All three say Other observations (no action needed)
Overall: the substantive review threads (test-tautology bugs, error-swallowing, single-allocator blind spot, monotonicity gap, doc lifecycle) are all correctly fixed with matching revert-checks, not just claimed fixed. Only the stale filename references are outstanding, and they're cosmetic. |
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| // only forward left outside this gate while its two siblings were | ||
| // inside it, which made it the cheapest way to that path for anything | ||
| // with peer-port reach. | ||
| fullMethod == pb.Internal_Forward_FullMethodName |
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When code uses the exported NewCoordinatorWithEngine path with an admin-token-protected peer, follower writes still go through Coordinate.redirect, whose cli.Forward call at kv/coordinator.go:1525 never attaches the token and has no token configuration surface. Adding the global gate here therefore makes every such redirected write fail with Unauthenticated; thread the peer credential through this forwarding implementation as well, rather than updating only LeaderProxy.forward.
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| func TestBatchAllocatorIssuesEachTimestampAtMostOnce(t *testing.T) { | ||
| t.Parallel() | ||
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| alloc, _ := newSlotClaimTSOFixture(t) |
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The fixture used here never applies the cutover or Phase-D markers, so all four uniqueness/monotonicity tests exercise the ordinary HLC reservation branch rather than the Phase-D-specific reservePhaseDWindow branch selected by TSOStateMachine.PhaseDActive(). A regression that duplicates or reverses timestamps only during Phase-D window reservation would therefore leave these purported Phase-D invariants green; activate Phase D before starting issuance, as the boundary test later in this file already does.
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| // The invariants below are the decision-independent half of | ||
| // docs/design/2026_08_29_proposed_tso_batch_slot_claims.md §6. They hold under |
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This commit deletes the _proposed_ document in favor of docs/design/2026_08_29_partial_tso_batch_slot_claims.md, but this reference—and the analogous references in kv/sharded_coordinator_leader_test.go and adapter/admin_grpc_test.go—still names the deleted file. Following the tests' rationale therefore leads to a nonexistent document; update all three references to the new _partial_ path.
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Acts on
docs/design/2026_08_29_proposed_tso_batch_slot_claims.md, whose stated purpose was to get a tradeoff decided before either option lands.The decision
Phase D stays batched. §3.1 (force
batchSize == 1) is rejected as an interim:CLAUDE.mdnames "no Raft round trip perNext()" as the invariant batching exists to preserve, and §3.1 would violate it on exactly the Phase-D path — in exchange for a window that narrows from unbounded to one round trip rather than closing. §3.2 (durable per-slot claims) remains the fix and needs its own proposal, because a claim record is a wire/on-disk decision: what it is, who owns it, how it compacts, what happens across leadership change.This PR lands the two pieces that do not depend on that choice.
§3.3 —
Internal.Forwardbehind the admin tokenThe doc calls this "worth doing regardless".
adminTokenProtectedMethodalready coveredInternal.ForwardAdminProposalandInternal.ForwardLeaseRead;Internal.Forwardwas the one forward left outside it, which made it the cheapest route to the durable-timestamp validation path for anything with peer-port reach.Both halves ship together, which is the load-bearing detail:
kv/leader_proxy.go's lease-read forward already attached the token, the write forward did not. Protecting the method without attaching the credential would have broken every forwarded write instead of authenticating it.An empty token attaches nothing on the client and disables enforcement on the server, so an unconfigured cluster behaves exactly as before on both ends — the change is symmetric by construction.
SetLeaderReadTokengainsSetPeerForwardTokenas the name for what it now covers; the old name stays as the setter it delegates to.§6 — the invariants that hold whichever option lands
OCC's conflict check is
latestTS(key) > startTS, so two commits sharing a timestamp can each read the other as not-newer. Uniqueness is load-bearing for correctness, and it has to survive whatever the slot-claim work changes about validation — so these are written before the mechanism is chosen rather than after.Deliberately not added: a test asserting that an unclaimed slot inside a committed window is refused. It is not refused today — that is the hole the design doc exists to close — and asserting current behaviour there would lock in the bug.
Risk
RelayPublish,ExportRangeVersions,ImportRangeVersionsandPromoteStagedVersionsremain outside the gate. Each needs the same two-sided treatment, and their clients are constructed through the split-migration factory rather than in these packages, so wiring them here without being able to exercise them end to end would risk breaking the migration plane. Tracked, not half-done.Test evidence
go test ./kv/ -race -count=1 -timeout 40m—ok 17.0sgolangci-lint --config=.golangci.yaml run ./kv/... ./adapter/...— 0 issuesTestForwardedWriteCarriesThePeerTokenFAILSInternal.Forwardoutside the gate →TestInternalForwardIsBehindTheAdminTokenFAILSBatchAllocatorcollapses adjacent offsets →TestBatchAllocatorIssuesEachTimestampAtMostOnceFAILS withhanded timestamp 117275466911514686 out 2 timesSelf-review
-race. The auth change is on the forwarding path only; leadership change and retry behaviour are untouched.@codex review
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https://claude.ai/code/session_013rNHooj7NF3giihWVba8QE
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