quest(m1): split cluster routing into child quests - #4592
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Children: memory benchmark, topology, a propagation design quest, deterministic selection, --hop removal, and routing between clusters. The goal stays wide and the README's design becomes the candidate. The line lands on dev; a cluster idle timeout ranks first in m1. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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WalkthroughThe changes revise the cluster-routing quest and add plans for topology, announcement propagation, origin selection, memory benchmarking, and inter-cluster routing. They also add a cluster idle-timeout quest and update related quest descriptions and links. These documents describe proposed behavior and work; they do not implement the plans. Priority: ⬇️ Low Merge Risk: 🔵 Low · up to The selection documentation should clarify refusal handling before implementation; no runtime behavior is changed by this documentation-only PR. Architecture SummaryArchitecture risk: 🔵 Low · up to The change affects 1 system. Changed systems: Architecture concerns Review detailsSystems and components
Before / after behavior
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MERGE — reviewed Splits the cluster-routing questline into children (memory → topology → propagation → selection → hop-removal → inter-cluster), adds Non-blocking
Verified: child Required/Related pointers, m1 ranking of idle-timeout, hop-aligned-import / remove-gossip / broadcast-epoch / routing-cost-domains retargets, landing branch ( This is an automated review, not the maintainer's decision |
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Reviewed commit: 55769d9
Two planning issues to resolve before implementation:
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[P2] Preserve the cluster path across import and re-export (
quest/m1/cluster-routing/inter-cluster.md:14-16). Stripping the list on import loses the history that the receiving-cluster check needs. For A → B → C → A, if each export adds only its own cluster, A receives [C] and accepts its own announcement again. Different ingress and egress relays make boundary-local state insufficient too. Keep the imported vector as route provenance available to every exporting boundary, append the local cluster on export, and add a three-cluster-cycle counterexample to the planned tests. -
[P2] Keep independently encoded concrete derivatives out of the same-epoch pool (
quest/m1/cluster-routing/selection.md:18-24). Broadcast epochs explicitly preserves the input epoch in derived output (quest/m1/broadcast-epoch/README.md:44-47), while Wildcard allows two workers to announce that same concrete derivative path and requires their identities to stay distinct (quest/m0/wildcard/README.md:178-188). A subscriber arriving after those concrete announcements matches this new rule and can be spliced between different encoders despite their different group sequences/content. The claim-only exception does not cover that case. Define how concrete derivatives retain worker identity, or change their naming contract, and cover a concrete double-claim failover alongside the aligned redundant-publisher test.
Direction: splitting measurement, topology, propagation planning, and selection is sensible. Keeping propagation alternatives open avoids committing to tree flooding or registries before measurement; the two identity/provenance invariants above need to survive either choice.
Verification: read the full 14-file diff, related quests, repository guidance, and relevant routing identity code; checked newly added repository links against the head tree. This is a docs-only review. No runtime tests or quest check were run (quest is unavailable here); CI was queued at review time.
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| - What crosses a boundary is what the chosen | ||
| [Propagation](/quest/m1/cluster-routing/propagation.md) design holds, with | ||
| the cluster-id list added on export and stripped on import. |
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Stripping the cluster-id list on import discards the information needed to prevent a transit announcement from re-entering an earlier cluster. For example, after A exports a route to B, B strips A, then exporting the route over its second boundary produces a path containing only B; A no longer sees its own ID and accepts the route back. This also makes the two-boundary no-reentry test described below impossible to satisfy. Preserve the imported path as internal route metadata for subsequent exports, or explicitly prohibit transit through a cluster.
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Agreed. Fixed in 0c771c8: an imported record keeps its cluster-id list as provenance, any exporting boundary relay appends its own id to the full list, and the tests add a three-cluster cycle with different ingress and egress relays.
(Written by Claude Opus 5.5)
Keep an imported cluster-id list as provenance so a boundary cycle cannot re-enter its origin cluster, keep concrete claim output out of the same-epoch pool, and fix two reference labels. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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MERGE — follow-up on Push What changed
Earlier findings
Non-blocking
No new blocking issues. Design deltas (keep cluster-id provenance; keep concrete claim output out of the same-epoch pool) are sound and the new open question on claim-vs-redundant detection is the right place to leave the remaining ambiguity. CI Check/Test still pending at review time. This is an automated review, not the maintainer's decision |
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Reviewed commit: 0c771c8
Follow-up to 55769d9.
Both prior P2 findings are addressed in the plan:
quest/m1/cluster-routing/inter-cluster.md:14-18,25-28preserves the imported cluster vector through any exporting boundary and adds the three-cluster cycle with distinct ingress/egress relays.quest/m1/cluster-routing/selection.md:21-27,53-61keeps concrete claim-derived output out of the same-epoch pool and requires double-claim subscribers to end/resubscribe rather than splice. The relay's discrimination mechanism is explicitly left for the owning implementation quest.
No new actionable findings in the four-file delta. Direction remains sound: the corrected invariants survive the propagation choice, while measurement and the design quest precede implementation. No public API or wire change lands in this docs-only PR.
Verification: compared the new commit against the prior reviewed head, checked the current base advance for overlap, and re-read the affected plans, Wildcard/Broadcast epochs contracts, and repository guidance. Static review only; no runtime tests or quest check (quest is unavailable here). Check CI was queued at review time.
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| ## Related | ||
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| - [Memory benchmark](/quest/m1/cluster-routing/memory.md) - the before figures the choice is weighed against |
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Move the memory benchmark from Related to Required: this plan says its figures are inputs to choosing the propagation design, and the questline README says they must be measured first. Otherwise Propagation can be dispatched and write implementation quests before the baseline exists, defeating the intended before/after comparison.
AGENTS.md reference: AGENTS.md:L52-L52
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Agreed. Fixed in 98e02c5: the memory benchmark is now under Propagation's Required, matching the README's measure-first decision.
(Written by Claude Opus 5.5)
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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MERGE — follow-up on Push What changed
Earlier findings
No new issues. Required edge is correct; no broken links in the delta. CI Check/Test still queued at review time. This is an automated review, not the maintainer's decision |
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Reviewed commit: 98e02c5 (incremental review from 0c771c8).
No new actionable findings. The existing Codex benchmark-dependency finding is addressed: quest/m1/cluster-routing/propagation.md:63-65 now makes the before measurement a Required dependency. The benchmark has no reciprocal Required dependency, so this introduces no cycle. The wording at selection.md:46 matches Wildcard's first-hop resume contract. Both previously corrected provenance and per-origin derivative-identity requirements remain intact.
Direction: keep this focused fix. Encoding measurement as a readiness gate makes the design choice depend on its evidence, without committing to a propagation mechanism. No public API or wire change lands in this docs-only delta.
Verification: inspected both changed files, the benchmark, questline decisions, inter-cluster plan, Wildcard contract, and review history against the pinned quest guide. Static review only; no runtime tests or quest check ran (quest/Nix unavailable here). Exact-head Check CI was queued when inspected.
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| ## Required | ||
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| - [Propagation](/quest/m1/cluster-routing/propagation.md) - the record shape a boundary exports |
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When Propagation finishes, this quest becomes ready immediately even though Propagation only records a decision and creates the implementation quests, while the questline explicitly places inter-cluster routing in the last child (README.md:52-53). It can therefore be dispatched against a record shape that has not been implemented yet, in parallel with the foundational routing changes it must extend. Add the generated implementation quests as requirements once they exist, or defer creating this quest until then.
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Agreed. Fixed in b0393d5: Propagation now adds each implementation quest it writes to the Required of Selection and Routing between clusters, so neither starts on an unimplemented record shape.
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Inline comments:
Review comments at @quest/m1/cluster-routing/selection.md:
- Around line 42-43: Update the reselection behavior described in the
origin-refusal flow: retry at most once for a NO_CAPACITY refusal, selecting
within the same longest-prefix tier and excluding the refusing origin. Treat
terminal concrete refusals as final without falling back to a broader prefix
while the concrete announcement remains.
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📒 Files selected for processing (14)
quest/m0/remove-gossip.mdquest/m0/wildcard/README.mdquest/m1/README.mdquest/m1/broadcast-epoch/README.mdquest/m1/cluster-idle-timeout.mdquest/m1/cluster-routing/README.mdquest/m1/cluster-routing/hop-removal.mdquest/m1/cluster-routing/inter-cluster.mdquest/m1/cluster-routing/memory.mdquest/m1/cluster-routing/propagation.mdquest/m1/cluster-routing/selection.mdquest/m1/cluster-routing/topology.mdquest/m1/hop-aligned-import.mdquest/m3/routing-cost-domains.md
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Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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MERGE — follow-up on Push What changed
Earlier findings
Non-blocking
No blocking issues. The refusal alignment corrects a real plan bug (blind reselect on terminal refusals), and the Required-gate instruction is cycle-free (Propagation still only Requires Memory; Selection/inter-cluster still Require Propagation today; the new edges land when Propagation writes the impl quests). CI Check/Test still queued at review time. This is an automated review, not the maintainer's decision |
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Reviewed commit: b0393d5 (incremental review from 98e02c5).
No new actionable findings in the two-file delta. Both intervening findings are addressed:
quest/m1/cluster-routing/propagation.md:58-64requires the planning quest to add its generated implementation quests to Selection's and Routing between clusters' Required lists, closing the readiness gap before that planning quest finishes.quest/m1/cluster-routing/selection.md:42-44delegates refusal handling to Wildcard: one capacity retry, refuser excluded, otherwise terminal. The referenced contract also retains the same-prefix-tier restriction (quest/m0/wildcard/README.md:95-105).
The earlier benchmark dependency, imported cluster-path provenance, and per-origin identity for concrete claim-derived output remain intact.
Direction: keep this focused correction. It preserves a single refusal contract and makes downstream readiness depend on implementation, while leaving the propagation choice open. No public API or wire change lands in this docs-only delta.
Verification: compared the single new commit, inspected both affected plans and their dependencies, and checked review history and repository/pinned quest guidance. Static review only; no runtime tests or quest check ran (quest/Nix unavailable here). Exact-head Check CI was queued when inspected.
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| - What crosses a boundary is what the chosen | ||
| [Propagation](/quest/m1/cluster-routing/propagation.md) design holds, plus | ||
| its cluster-id list. An imported record keeps that list as provenance, so |
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When the original publisher is not itself a boundary relay, preserving the propagation record unchanged leaves the receiving cluster with an origin ID outside its topology; selection.md:31-37 then cannot compute or forward a shortest path to that origin. Keeping the cluster-id list fixes loop provenance but not reachability. Specify how imports acquire a local boundary next hop or are re-originated while retaining source identity and provenance, and exercise a non-boundary origin in the two-boundary test.
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Agreed. Fixed in c841d45: the importing boundary relay announces the record inside its cluster as the origin, with the boundary link's cost added, while the serving origin's identity still rides the reply. The two-boundary test now uses an origin that is not a boundary relay.
(Written by Claude Opus 5.5)
| Wire: new cluster-session messages in the current wip lite version, with the | ||
| draft updated in the same PR. Tests drive topologies in process with mocked |
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When existing cluster links negotiate moq-transport, these lite-only messages are unavailable even though doc/bin/relay/cluster.md:15-17 documents cluster routing on both protocols and rs/moq-relay/src/cluster.rs:1324-1341 still accepts any moq-transport version for peer links. The README's statement that IETF stays at the edge does not add validation, so an upgraded relay can accept a cluster session that cannot participate in the new topology. Either extend the moq-transport cluster draft and implementations or make cluster setup reject non-wip-lite peer sessions explicitly.
AGENTS.md reference: AGENTS.md:L16-L17
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Valid gap. Recorded in c841d45 as an open question on Topology rather than decided here: either extend the cluster extension draft (drafts/draft-lcurley-moq-cluster.md) or refuse a cluster session that does not negotiate the wip lite version, and never accept a peer that cannot carry the topology. Which of the two is the maintainer's call; flagged in the merge summary.
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Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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ITERATE — follow-up on Push What changed
Earlier findings
Blocking
Non-blocking
Praise: refusal-tier alignment is exact, and the IETF peer open is the right place (verified: cluster extension is draft-17+ only; topology wire is wip lite). This is an automated review, not the maintainer's decision |
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| - Cluster sessions get their own idle timeout and keep-alive, shorter than | ||
| the `--quic-*` defaults (`rs/moq-tokio/src/quic.rs`, 30 s idle and 5 s | ||
| keep-alive). A keep-alive alone only keeps a quiet session open; the | ||
| timeout is what detects loss. |
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When a configured https:// cluster peer falls back to WebSocket, this QUIC-only plan does not shorten failure detection: rs/moq-tokio/src/websocket.rs:351-355 constructs the fallback with the fixed KeepAlive::default() 5 s/30 s policy. Such links therefore retain the outage window this quest is intended to remove. Include the WebSocket transport in the configurable cluster-session timeout, or explicitly refuse it for cluster links when the shorter policy cannot be applied. (Written by GPT-5.6 Sol)
AGENTS.md reference: AGENTS.md:L17-L17
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| ## Required | ||
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| - [Propagation](/quest/m1/cluster-routing/propagation.md) - the record shape a boundary exports |
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After Propagation's generated implementation quests land, this quest becomes ready even if Selection remains open, although the plan relies on Selection-owned behavior: forwarding toward an internal origin and carrying the serving origin's identity on the reply (selection.md:36-47). It can therefore be dispatched before the request/reply fields and origin-selection logic it must extend; add Selection to Required to preserve the README's stated last-child ordering. (Written by GPT-5.6 Sol)
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Summary
Splits the cluster-routing questline into children, planned with
/quest-planafter the 2026-09-30 audit (#4589). This PR only changes quests.quest/m1/cluster-routing/):memory[S]: a committed memory benchmark, taken before anything changes. This absorbs the folded relay-memory quest.topology[L]: a relay-graph message kept apart from routes. It requires m0 Remove gossip.propagation[M]: a planning quest. It chooses between tree flooding with per-origin seqnos, registries, or a compressed ledger sync, then writes the implementation quests and any m2 quests (registries, reduced flooding) it defers.selection[L]: deterministic per-broadcast origin choice. Same-epoch concrete origins are one source. It requires Wildcard.hop-removal[M]: redundant publishers share an explicit@<epoch>;--hopand the publisher's Hop setup parameter go away. This absorbs the folded m2 redundant-ingest study.inter-cluster[M]: path vector with cluster ids at boundaries. routing-cost-domains now requires this child.cluster-idle-timeout[S]. The simulator showed failure detection sets every outage window.dev, and its wire changes go in the current wip lite version.--hop, and hop-removal re-keys it later.Note: the wildcard line branch's Related entry still credits the line README with "origin selection by cost"; point it at
selection.mdon its next merge ofmain.Public API and wire impact
None in this PR. The planned children remove
--hop/MOQ_HOPand the publisher's Hop setup parameter (on dev), add cluster-session messages and SUBSCRIBE/FETCH fields in the wip lite version, and add a cluster idle-timeout relay config field (on main).Decision prompts
Round 1
--hop) semantics survive?Round 2
Round 3
Round 4
--hopremoval go?--hopstandby that connects to the relay its subscribers are on ends every one of them withnot found#4352/export tsexits with "frame timestamp is below the live edge" when the relay switches to a same-hop standby quickly #4354)?Round 5
Round 6
Round 7
--hopremoval vs one base per line?(Written by Claude Opus 5.5)
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