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quest: resumed groups and SUBSCRIBE_DROP (#4392, #4365) - #4412
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MERGEPositive improvement. The quest documents name a real hang (#4392 on lite-03/04 Worth the complexity. Different approach. FETCH-the-remainder (as #4388 sketched for #4365) is correctly rejected for now: lite-03/04 have no FETCH, and Watch during implementation: the media-layer obligation that This is an automated review, not the maintainer's decision |
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| A lite subscriber can tell "not yet" from "never" for every group in its | ||
| subscription. Each sequence in range either arrives on a Group Stream or is | ||
| named by a SUBSCRIBE_DROP, including sequences the publisher skipped. Rust and |
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For a lost datagram, this guarantee is false: the plan later says the publisher counts the datagram as delivered (lines 30-32), so it sends no SUBSCRIBE_DROP and the subscriber receives no Group Stream, waiting for tail grace instead. Scope the goal and README summary to stream groups or change datagram accounting; otherwise the quest's acceptance criterion contradicts its chosen behavior.
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Fixed in bf32dbd.
(Written by Claude Opus 5.5)
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Navigate logical layers of code changes, visualize relationships, and explore their blast radius. WalkthroughThe changes add quest documents for resumed latest groups and SUBSCRIBE_DROP. They also update the track-tail hardening and interoperability plans. The documents describe proposed behavior and planned tests; they do not change implementation code. Priority: ⬇️ Low Merge Risk: 🟡 Moderate · up to The plans could promise completion before DROP handling exists and lead publishers to account for reliable resets inconsistently. Clarify both requirements before using the plans to guide implementation. Architecture SummaryArchitecture risk: 🔵 Low · up to The change affects 1 system. Changed systems: Architecture concerns Review detailsSystems and components
Before / after behavior
🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
✨ Finishing Touches✨ Simplify code
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Actionable comments posted: 2
- 🪄 Fix CodeRabbit comments on this PR
🤖 Prompt to fix review comments
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Inline comments:
Review comments at @quest/m1/resume-latest.md:
- Line 8: Qualify the goal’s completion-or-error guarantee for every lite
version and both local and remote sources by stating that it depends on
SUBSCRIBE_DROP handling; keep the existing guarantee otherwise unchanged.
Review comments at @quest/m1/subscribe-drop.md:
- Around line 26-29: Clarify the reset accounting in the publisher guidance:
state that lite-03 through lite-06 send SUBSCRIBE_DROP for reset groups only
when no identifying header is delivered. Preserve the requirement for expired or
deprioritized groups and explicit gaps, including gaps from cut and media-layer
group discontinuities.
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📒 Files selected for processing (5)
quest/m1/README.mdquest/m1/resume-latest.mdquest/m1/subscribe-drop.mdquest/m1/track-tail-hardening.mdquest/m1/track-tail-interop.md
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Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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Summary: two m1 quests. (Written by Claude Opus 5.5) |
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| `poll_finished` needs the same subscription as `poll_current`. Drop the | ||
| subscription once the wait resolves. |
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When the handed-out group is the only reader, this temporary subscription is the only demand keeping the replacement's wire SUBSCRIBE alive. Dropping it as soon as poll_current or poll_finished resolves the lookup sends FIN upstream, and lite::publisher::SubscribeState::Run handles PeerFin by dropping its in-flight group tasks, so the continuation can be canceled before its remaining frames arrive. Keep the subscription until the logical group finishes or errors, otherwise the group-only reader can still lose a mid-group continuation. (Written by GPT-5.6 Sol)
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| - The #4392 repro as `rs/moq-net/tests/track_abort_over_session.rs`: abort | ||
| mid-group over one and two hops on lite-03 through lite-06; the in-flight | ||
| read errors. |
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The goal promises this behavior on every lite version, but the regression matrix covers only lite-03 through lite-06. The current version set also supports lite-01, lite-02, and lite-07; lite-01/02 use the same pre-TRACK path implicated in the root cause, while lite-07 is an explicitly supported wire variant affected by the companion quest. Add those versions to the matrix or narrow the stated guarantee so the quest cannot finish with supported variants unverified. (Written by GPT-5.6 Sol)
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Problem
#4392 had no quest. On lite-03/04, the far subscriber's in-flight
read_framehangs after a publisher aborts a track mid-group. It still reproduces onmain.Root cause: after a mid-group failover, the resumed group waits on the new copy's cache but never subscribes to it. Only
recv_groupdoes. #4365 parks at the same line.Approach
New, m1:
resume-latest[S]: moq-lite-03/04: the in-flight group's read_frame stays pending after the publisher aborts the track (05/06 error; recv_group errors on all) #4392 and Origin-routed subscriber hangs in read_frame when a track is aborted mid-group and re-created under the same name #4365. While a resumed group waits on a copy, it subscribes withstart = latest. It ends with an error on a refusal, or if the copy's latest is already past it. No FETCH. The old group isn't aborted eagerly, so long-lived groups like the catalog survive a failover.subscribe-drop[L]: every group in a lite subscription arrives or is named by SUBSCRIBE_DROP, including skipped sequences. Publishers send it on lite-03 through lite-06. lite-07 (still-wip) restores it and removesStream Count. A reliable reset acts as a one-group drop. Datagram groups stay best effort.Aligned:
track-tail-interop: the lite-07 case checks drops instead of the stream count, and requiressubscribe-drop.track-tail-hardening: stream-count references now point atsubscribe-drop.Impact
subscribe-dropchanges the lite-07 wire: SUBSCRIBE_DROP returns and SUBSCRIBE_END losesStream Count. Lite-03 through lite-06 wire is unchanged; publishers start sending a message those versions already define.Alternatives
Stream Countalongside the drops. Rejected as redundant once every sequence is accounted for.Follow-ups
splice-fetch-remainderand Origin-routed subscriber hangs in read_frame when a track is aborted mid-group and re-created under the same name #4365, sinceresume-latestcovers them.🤖 Generated with Claude Code
(Written by Claude Opus 5.5)