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quest(m1): settle dynamic range requests and split out fetch as a range - #6123
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Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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Outcome of the quest start: claimed, scoped, and stopped at seven maintainer decisions (in the quest diff and the PR body) before implementing. Recommended path is decision 6's split, with the frame-bounds quest landing before the (Written by Claude Opus 5.5) |
The maintainer settled the seven open questions: track::Fill handler, misses only below the frontier, max_delay as Option<Duration>, per-group FETCH sessions until the range quests land, moq-c follows whichever of #6052 lands first, and fetch_group removal moves to fetch-range.md, which requires frame bounds. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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WalkthroughThe documentation updates the Dynamic range-request plan. It specifies Priority: ⬇️ Low Merge Risk: 🔵 Low · up to
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The title clearly summarizes the planning changes: it settles dynamic range requests and separates the fetch-as-a-range work. |
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The pull request description clearly matches the planning-only documentation changes. It identifies the updated quest documents, the settled API and design decisions, the new fetch-range quest, and th… |
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The pull request description clearly matches the planning-only documentation changes. It identifies the updated quest documents, the settled API and design decisions, the new fetch-range quest, and the absence of implementation or wire changes.
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| each group it has and `drop_groups(range)` for the rest. Dropping the `Fill` | ||
| names whatever is left as dropped, in the track's existing `drops`. |
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If the last requesting subscriber disconnects while a session is serving a fill, the later session plan stops and drops the remaining Fill; this destructor would then insert those sequences into the track's durable drops set. A subsequent subscriber requesting the same still-fetchable history will therefore receive SUBSCRIBE_DROP instead of triggering a fresh upstream fetch, unlike the current withdrawn group::Request behavior. Reserve persistent drops for explicit drop_groups decisions and let demand cancellation withdraw the fill without poisoning future requests.
AGENTS.md reference: AGENTS.md:L18-L18
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Agreed, fixed in 7aa15d0. A Fill dropped while a reader still wants its range names the rest dropped; once demand leaves it is withdrawn like a group::Request today and records nothing, so the durable drops set never hides still-fetchable history. The Sessions bullet now says the same.
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| - **Sessions.** A session serves a fill as it serves a group request today: | ||
| one FETCH per group, one in flight per fill, newest first for a descending | ||
| reader, withdrawing (not dropping) the fill when demand leaves, and | ||
| dropping the rest once a fetched group is stale under the fill's budget (a |
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When current readers have a narrow max_delay but publisher retention permits a wider one, this step drops the entire remaining fill once one group is stale under the current fill budget. Because the handler shape records drop_groups and unfinished fills in the track's durable drops, a later reader with a wider budget or None will receive a drop instead of triggering a new fill for history that is still fetchable. Either withdraw or record a budget-qualified stale remainder, or make the budget-aware drop-set work a prerequisite so this quest is independently landable.
AGENTS.md reference: AGENTS.md:L24-L24
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Agreed, fixed in 4a0620b. Groups older than a stale one are withdrawn, not dropped; each reader's cursor names them stale under its own budget, so a later reader with a wider budget (or None) can still fill them. Only staleness under publisher max-age, which binds every reader, goes in the durable drops.
(Written by Claude Opus 5.5)
| per run. Until then, one SUBSCRIBE range can cost up to frontier minus floor | ||
| serialized upstream FETCHes; accepted rather than blocking on those quests. |
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When an untrusted downstream requests a range from group 0 and the peer-controlled frontier is very large or sparse, this explicitly permits frontier - floor serialized upstream FETCHes. A one-in-flight limit bounds concurrency but not total network, CPU, or task lifetime, so a single range with a large group number can keep a relay issuing requests effectively indefinitely. Coalesce the run before this quest lands, or impose and enforce a finite per-request work bound instead of accepting span-proportional fan-out.
AGENTS.md reference: AGENTS.md:L18-L18
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Keeping this as planned: the maintainer chose per-group FETCH with one in flight per fill (decision 5 in the PR body) over blocking on the lite-07 and moq-transport range quests, which coalesce runs. The total is bounded the same way today's per-group requests are: by the fill's budget and publisher max-age (older groups stop once one is stale), and by demand (the fill is withdrawn when readers leave). A downstream can already drive that cost with one request per group. I added that reasoning to the Sessions bullet in 4a0620b.
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Actionable comments posted: 5
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Inline comments:
Review comments at @quest/m1/subscribe-ranges/dynamic.md:
- Around line 69-70: Update the ascending-range handling described in the
“fetched group is stale” flow so an old first group does not terminate
processing of newer groups. Evaluate each ascending group independently, or
limit the early termination to descending reads, preserving delivery of later
valid sequences.
- Around line 77-80: Update the documentation around the frozen moq-c ABI to
explicitly mark retaining poll_requested_group as an intentional compatibility
exception to the requested_group replacement goal, and define how the frozen
crate internally maps or splits fills into per-group requests while preserving
its existing ABI.
- Around line 42-45: Clarify the shared track::Fill contract around
Dynamic::requested_fill so each reader’s max_delay is enforced independently,
despite the fill exposing only the most tolerant budget. Define the required
per-reader filtering or split-fill behavior, ensuring sharing never relaxes any
caller’s budget, before proceeding with implementation.
Review comments at @quest/m1/subscribe-ranges/fetch-range.md:
- Around line 22-23: Revise the fetch-range plan to preserve the existing Old
and NotFetchable distinctions and boundary behavior. Account for Relay HTTP’s
NotFetchable-to-404 mapping, HLS cache-miss handling, FFI’s separate Old
handling for ordered reads, moq-c’s distinct protocol kind, and moq-cli’s
track-cut behavior before considering removal or migration.
- Around line 18-23: Clarify the bounded one-range recv_group contract around
MoqTrackConsumer::recv_group: distinguish an initially empty or unfillable range
from successful track completion, and define how the former maps to
MoqError::NotFound while retaining Ok(None) only for completion, or specify
another distinct result. Align the moq-ffi behavior and documentation with that
contract.
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quest/m1/subscribe-ranges/README.mdquest/m1/subscribe-ranges/dynamic.mdquest/m1/subscribe-ranges/fetch-range.md
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Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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| PR breaks one API once. That half needs head fills, which | ||
| [frame bounds](/quest/m1/subscribe-ranges/frame-bounds.md) provides. | ||
| - **Handler shape.** `Dynamic::requested_fill` yields a `track::Fill` naming | ||
| one bounded run: `start: Position`, exclusive end group, priority, the most |
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When a requested range ends partway through a missing group, this shape conveys only the start frame and an end group, so the handler cannot distinguish ..Position { group: 5, frame: 1 } from a request for all of group 5. The planned per-group FETCH therefore over-fetches the terminal group, allowing a peer asking for one frame to induce delivery and caching of an entire group. Make the fill end a Position so downstream demand bounds upstream work.
AGENTS.md reference: AGENTS.md:L18-L18
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Keeping the end as an exclusive group, per the maintainer's handler-shape decision. A fill populates the shared cache, not one reader: a group fetched only up to some frame would sit in the cache missing its tail, which a later reader wanting the whole group cannot tell from a complete one, and there is no tail fill to repair it (frame bounds covers head fills only). The work is also bounded the same either way: a peer asking for frame 0 of group 5 could ask for all of group 5, so the terminal group costs at most one group it was entitled to request. Each reader still sees only its own frames through the cursor's frame bounds.
(Written by Claude Opus 5.5)
| - **Fetch budget.** `Subscription::max_delay` becomes `Option<Duration>`: | ||
| `None` means publisher max-age alone, the FETCH default above. This breaks | ||
| `Subscription` in every binding, with a `MIGRATE.md` entry in each affected |
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If the generated C package has not landed, which lines 85-90 explicitly allow, the current frozen moq_subscription.max_delay_us is a required u64 and cannot represent None. Requiring this change in every binding therefore forces the implementation either to break the frozen C ABI, introduce an unspecified sentinel despite rejecting that representation, or silently omit publisher-only max-age semantics for C callers. Settle the C representation or make the generated package a prerequisite.
AGENTS.md reference: AGENTS.md:L59-L60
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Fixed in ea5166a, within the maintainer's moq-c decision (frozen ABI unchanged unless moq-dev/moq#6052 lands first): the frozen crate maps max_delay_us to Some, so a frozen C subscriber keeps today's semantics and cannot ask for max-age alone. The generated package exposes the Option natively once it lands.
(Written by Claude Opus 5.5)
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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Merge summary: quest-only planning PR recording the seven maintainer decisions from the 2026-10-20 (Written by Claude Opus 5.5) |
Take main's deletes of quests it completed (auth/bindings, egress-held-state, stateless-reset-key, ffi-first-dial-failure and others); the audit's edits to them only added ordering that no longer applies. Take main's settled subscribe-ranges/dynamic.md, whose moq-c decision (#6123: not a blocker) supersedes the audit's c/README requirement. Keep both sides' index entries. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Quest:
quest/m1/subscribe-ranges/dynamic.mdSummary
Planning only, no code. Starting the quest turned up seven decisions that set an API break in every binding and how many upstream FETCHes one SUBSCRIBE range can trigger, so the agent stopped before implementing. The maintainer settled them in a
/quest-planinterview on 2026-10-20, recorded in the quest Plans:quest/m1/subscribe-ranges/dynamic.md: nowrequested_group→requested_filland subscriptions filling their misses.quest/m1/subscribe-ranges/fetch-range.md(new, [M]):fetch_groupbecomes a one-range subscription, plus the fill benchmark. Requiresdynamic.mdandframe-bounds.md(head fills).quest/m1/subscribe-ranges/README.md: lists the new quest.Implementation starts afresh from
dynamic.mdonce this merges.Decisions (paper trail)
Goal: a reader's misses below the cache reach
track::Dynamicas bounded range fills instead of per-group requests; every sequence in range arrives or is named dropped;requested_group/fetch_groupare replaced in every caller, binding, andmoq fetch. Non-goals: lite-07 range SUBSCRIBE, moq-transport run FETCH, time anchors.requested_fillfirst,fetch_groupremoval after frame boundstrack::Fillwithaccept/drop_groups; dropping it names the rest droppedProducer::create_groupDuration::MAXsentinel, saturating on the wire (recommended)Option<Duration>:Nonemeans max-age alone; breaksSubscriptionin every bindingrecv_groupreturnsNoneonce the window is accounted for; ffi maps a miss toNotFoundpoll_requested_groupReview follow-ups
Refinements from Codex and CodeRabbit, within the decisions above:
Filldropped after its demand leaves is withdrawn and records nothing, so the durabledropsnever hides still-fetchable history.max_delay. Only publisher max-age staleness goes indrops.max_delay_ustoSome.fetch-range.md:Ok(None)before any group is a miss (NotFoundin moq-ffi); the fetch boundaries that collapseNotFetchable/Oldare listed, and both stay wire errors.Public API and wire impact
None in this PR. The planned work breaks
track::Dynamic::requested_group,Subscription::max_delay,track::Consumer::fetch_group, and their moq-ffi/moq-c/binding surfaces; no wire change.Checks
quest check: ok (432 documents).(Written by Claude Opus 5.5)
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