63 lines
3.4 KiB
Markdown
63 lines
3.4 KiB
Markdown
# 13 — Harden failure, cancellation, and restart semantics
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Status: ready-for-agent
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## Mandatory fresh-session context
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- Read [RALPH-CONTEXT.md](../RALPH-CONTEXT.md) completely before changing code.
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- This issue is `DGR-013` in [prd.json](../prd.json).
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- Read the evidence README for every dependency listed below.
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- Inspect current code and `git status`; historical text and previous agent claims are not evidence.
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## Description
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As a client, I need failures to be bounded and explicit so that distributed speed does not come with hanging or corrupted generations.
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## Expected durable outputs
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- Failure/cancel/restart test matrix
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- Resource cleanup and billing-state evidence
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- evidence/DGR-013/README.md
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## Acceptance criteria
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- [ ] Deadlines and heartbeat/health loss terminate blocked stream operations.
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- [ ] Cancellation propagates across every Shard and releases local KV and queued buffers.
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- [ ] Duplicate steps are idempotent; uncertain mutations are never replayed silently.
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- [ ] Alpha failover restarts from token zero on a newly compatible route rather than importing unverified KV.
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- [ ] Worker death, stream reset, malformed bundle, stale epoch, and cache miss tests pass.
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- [ ] Billing/work records distinguish completed, cancelled, failed, and unverified work.
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- [ ] Targeted pytest tests pass
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- [ ] python -m compileall packages tests passes for Python changes
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- [ ] git diff --check passes
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- [ ] Default tests remain deterministic, model-download-free, API-credit-free, and GPU-free
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- [ ] Full deterministic pytest -q passes, or the exact pre-existing unrelated failure is recorded with a clean-tree reproduction
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- [ ] Pinned native C++ target builds and focused CTest/protocol tests pass where native code is touched
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- [ ] llama.cpp patch stack applies cleanly to the exact pinned commit where patch code is touched
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- [ ] Read .scratch/distributed-gguf-runtime/RALPH-CONTEXT.md and this story issue completely before changing code
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- [ ] Read and verify every dependency evidence README before relying on dependency behavior
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- [ ] Preserve all pre-existing working-tree changes and stage only files belonging to this story
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- [ ] Write .scratch/distributed-gguf-runtime/evidence/DGR-013/README.md with files changed, exact commands and real results, limitations, compatibility notes, and dependent-story handoff
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- [ ] Update only this story issue to Status: done after every acceptance criterion and quality gate passes
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## Dependency handoff
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- `DGR-008` must have `passes: true`; read `../evidence/DGR-008/README.md` and verify its referenced files/commands.
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- `DGR-009` must have `passes: true`; read `../evidence/DGR-009/README.md` and verify its referenced files/commands.
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- DGR-012 continuous batching is post-alpha; this story must harden single-session failure/cancellation first and later extend the same invariants to batched sessions.
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## Finish contract
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- Create the task evidence directory and durable handoff required above.
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- Preserve real failures and blockers; never fabricate benchmark, model, test or hardware output.
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- Change this issue to `Status: done` only after all criteria pass.
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- Emit `<promise>COMPLETE</promise>` only after the evidence handoff exists.
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## References
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- [Ralph execution context](../RALPH-CONTEXT.md)
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- [PRD](../PRD.md)
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- [Implementation strategy](../implementation-strategy.md)
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- [Current architecture](../architecture.md)
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- [Architecture decision](../ADR-0020-distributed-gguf-runtime.md)
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