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2 Commits
Author SHA1 Message Date
velixio aa1d739843 feat(workers): dubbing goes remote, and the protocol stops lying to old workers
The remote-GPU line, verified on hardware rather than asserted.

**Dubbing renders on the worker.** dub_generate.py dispatches the coarse
`dub_segments` operation through the gateway, following the audiobook
pattern: per-unit local fallback after consecutive remote failures, one
aggregated notice rather than one per segment. A 40-minute dub that loses
its worker at segment 200 degrades instead of producing 200 error rows.

**An out-of-date worker is now refused by name.** This was the worst
defect in the plan and it was silent: an un-upgraded worker registered
cleanly, then ignored `inputs` and rendered a clone with NO reference
audio — returned as success. A plausible wrong result with nothing
anywhere to surface it. Workers now declare features, and one missing
them is turned away with the features named and `no task was run`.
Verified live: a worker one commit behind was correctly refused.

**"Offline" and "cannot run this" are different facts.** Asking a live
worker for an engine it lacks answered "is offline or cannot be reached.
Wake the selected worker" — while that worker reported ready, one free
slot and 3.6 ms latency. The user was sent to wake a machine that was
already awake. The scheduler now distinguishes absent from present-but-
incapable, and names the engine rather than the operation, because the
engine is the thing a user can install.

**An engine with no catalog entry is no longer hidden.** A `repo_ids`
non-emptiness check had been implemented as a runtime filter, so a worker
silently refused to advertise any engine lacking a models.yaml entry —
which is four registered engines, including CosyVoice. Users with those
already installed would have lost remote support with only a log line.
Empty `repo_ids` now means "not downloadable here", never "not runnable".

**And a script so this stops being done by hand.**
scripts/verify-remote-worker.sh runs the per-phase acceptance checks
against a live worker, non-destructively. Its preconditions are the
mistakes that cost the most time: exactly one listener on the control
port (two instances silently shared it), and never detecting the worker
with a pgrep pattern that matches the ssh shell running it.

Its first real run found the dubbing picker claiming remote placement.
That turned out to be the CHECK being stale, not the picker — the port
had landed since it was written. It now asserts self-consistency instead:
the picker may claim remote only for an operation the control plane
actually advertises as remotely producible, which cannot rot the next
time an op is ported.

Backend 5291 passed, frontend 1812 passed. Acceptance script: no
automated failures across Phases 4-8 on an RTX 4090. Four checks remain
MANUAL by design — true airplane mode, concurrent downloads, killing a
worker mid-audiobook, and the model-list UI — and are reported as
unverified rather than passed.
2026-08-11 17:39:46 +05:30
velixio bda169c900 feat(workers): pin work to the chosen GPU, and say when its model is missing
Three phases that only make sense together: a job that names a worker,
a worker that reports honestly what it can actually run, and the small
defects that made both lie.

**Pinning** (Phase 1). `pinned_worker_id` is now honoured in both places
that choose a worker — `eligible_workers` and `select_worker` build
independent lists, so applying it to one silently leaked work onto
whichever machine was least busy. The pin persists across a restart via
an additive column, deliberately not alembic (justified in the code, per
the precedent already in db.py): quitting mid-render used to drop it
without a word. `max_attempts=1` was rejected as the mechanism — it makes
the FIRST failure terminal, including the penalty-free ones a stale
advisory view produces routinely.

Cancel now actually reaches the worker. `WorkerServicer.cancel` had zero
callers, so cancelling released the slot while the GPU thread kept
running, and a late result could resurrect the task as COMPLETED —
`commit_result` assigned that state directly, bypassing the transition
table where CANCELLED is terminal by construction.

**Honest capabilities** (Phase 4). A worker now probes whether weights
are actually present, and a job stops BEFORE dispatch with a typed 409
naming the model and the machine, instead of failing mid-task. The probe
fails OPEN: `is_cached`/`cache_is_complete` cannot see a user-managed
clone outside the HF layout, so only a positive "absent" refuses.
Refusing an engine that works today would break the compatibility
promise. `pool.supports` deliberately still ignores `downloaded` — had it
not, the scheduler would drop the worker and answer with a terminal
NO_CAPABLE_WORKER, which tells the user to check their install when the
truth is one download away. The frontend no longer offers "Report this
bug" for that state; it offers the download.

Catalog tags resolve against the TARGET's OS/arch/backend, not this
machine's. From a Mac control plane, a CUDA worker's model list was
showing the mlx-community repos it cannot run and hiding the ones it
needs.

**And the quiet ones** (Phase 0 leftovers): a model's human label rides
its own proto field so renaming it cannot orphan breaker history; an
empty model_id no longer forks the capacity slot key into two slots for
one model; the idle sweep cannot evict an engine out from under a live
LOCAL render.

Verified on real hardware, which is the only verification that has ever
caught anything here: 2025 characters, default settings, routed to an
RTX 4090 over the wire — 100% GPU utilisation on the remote box, 119.6 s
of 24 kHz audio returned in 16.6 s, 5.7 MB delivered out of band through
the artifact path rather than the control stream.

Backend 5259 passed, frontend 1808 passed.
2026-08-11 15:24:11 +05:30