[kixelated]

Summary

A stats frame over group::MAX_CACHE_BYTES (32 MB) used to be dropped with a debug log, leaving readers on the previous snapshot indefinitely. publisher.json near 50k paths is the likely first hit.

Now Snapshot::update aborts that flavor's track with FrameTooLarge (and any open delta group), so readers see the track end. Only the failing flavor ends: DEFLATE can shrink a frame too large for the plain track, so the .z sibling keeps updating. An ended flavor is skipped on later ticks (no repeated encode or log), and write failures now log at warn.

A re-request for an ended flavor is refused with NotFound by the existing live-pair branch in adopt_pair / adopt_presence. Those comments called the branch unreachable, so I updated them.

Quest: deletes quest/m1/stats-frame-too-large.md. Prefix tracks from #5811 get the same rule if they publish through TrackPair.

API / wire impact

• Public API: none.
• Wire: no format change. Behavior change: a stats track can now end with FrameTooLarge. Documented in doc/concept/stats.md.

Tests

• produce::tests::oversized_frame_aborts_only_its_flavor: the plain reader ends with FrameTooLarge, and the compressed reader decodes the oversized value and then a later update. The test fails without the abort.
• just check passes.

Follow-ups

• Optionally reject a re-request for an ended flavor with its abort reason (FrameTooLarge) instead of NotFound.
• Long term: split or page large stats frames so publisher.json scales past the cache limit, instead of only failing loudly.

(written by Claude Opus 5.5)

🤖 Generated with Claude Code

[kixelated]

Quest outcome: quest/m1/stats-frame-too-large.md is fully implemented and the PR is ready for review. Nothing is left for the maintainer to decide. just check passed locally, and the new regression test fails without the fix.

(written by Claude Opus 5.5)

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📥 Commits

Reviewing files that changed from the base of the PR and between 3789ee2 and b6aa429.

📒 Files selected for processing: 4

• doc/concept/stats.md
• quest/m1/README.md
• quest/m1/stats-frame-too-large.md
• rs/moq-stats/src/produce.rs

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[chatgpt-codex-connector]

Codex Review Summary

This comment shows the latest Codex review activity on this pull request.

Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-10-17T02:40:32.671306Z	b6aa429	PR opened

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[kixelated]

Merge summary: a stats flavor whose frame is over the 32 MB cache limit now ends with FrameTooLarge, and its sibling flavor keeps updating. Readers no longer sit on a stale snapshot.

One choice made without asking: a new request for an ended flavor is refused with NotFound, using the existing path. Returning the abort reason is listed as a follow-up.

CI passed and Codex reviewed b6aa429 with no findings.

(written by Claude Opus 5.5)