Harden Python shutdown and resolve storage upgrade caveats - #484
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Included review availability: Your plan provides up to 1 included review per hour; 0 remain after this review. 📝 WalkthroughWalkthroughChangesStorage transition lifecycle
Python interpreter shutdown
Compatibility diagnostics
Estimated code review effort: 5 (Critical) | ~90 minutes Merge Risk: ⚪ Minimal · up to The shutdown, callback-routing, and quiesced-transition changes have targeted regression coverage with no actionable merge-blocking risk identified. Sequence Diagram(s)sequenceDiagram
participant Operator
participant awaCLI
participant StorageModel
participant RuntimeInstances
participant TransitionState
Operator->>awaCLI: enter-mixed-transition --quiesced
awaCLI->>StorageModel: enter_mixed_transition_quiesced
StorageModel->>RuntimeInstances: check fresh snapshots
StorageModel->>TransitionState: flip to mixed_transition
TransitionState-->>awaCLI: status report
awaCLI-->>Operator: print status
sequenceDiagram
participant PythonCode
participant AsyncBridge
participant NativeTask
participant PythonInterpreter
PythonCode->>AsyncBridge: create async future
AsyncBridge->>NativeTask: track task and callback
PythonInterpreter->>AsyncBridge: begin atexit shutdown
AsyncBridge->>NativeTask: abort and wait
NativeTask-->>AsyncBridge: release Python state
AsyncBridge-->>PythonInterpreter: shutdown complete
Poem
🚥 Pre-merge checks | ✅ 3 | ❌ 2❌ Failed checks (2 warnings)
✅ Passed checks (3 passed)
Full details: Out of Scope Changes checkExplanation The pull request contains substantial changes outside directly linked issue Full details: Docstring CoverageExplanation Docstring coverage is 61.42% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 127 functions across 15 files. (2 skipped: 2 unsupported.)
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Inline comments:
In `@awa-model/src/storage.rs`:
- Around line 130-131: Update the schema validation query in the
routing-transition logic to reuse the executor-compatible helper implementing
the complete queue_storage_schema_ready predicate, rather than checking only
queue_ring_state, ready_entries, and leases. Ensure the transition transaction
validates all required queue-storage relations, sequences, columns, and the
claim_ready_runtime contract before activating runtime_storage_backends, and add
coverage for a partial custom schema containing only those three relations.
- Around line 144-145: Update the quiescence cutoff expression near
make_interval so snapshot_interval_ms retains fractional-second precision
instead of truncating through integer division by 1000. Preserve the existing
minimum interval and three-times multiplier while ensuring values such as 30,999
milliseconds produce the intended millisecond-accurate cutoff.
In `@scripts/compat/run_python.py`:
- Around line 46-49: Update scripts/compat/run_python.py lines 46-49 around the
native-crash subprocess.run call to handle a missing gdb executable without
replacing the child result with a Python error, while preserving the
crash-result flow. Provision or verify gdb in .github/workflows/release-gate.yml
lines 139-143 and .github/workflows/nightly-chaos.yml lines 58-61 so both
workflows support native-crash backtrace generation.
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.github/workflows/nightly-chaos.yml.github/workflows/release-gate.ymlCHANGELOG.mdawa-cli/src/main.rsawa-model/src/admin.rsawa-model/src/storage.rsawa-model/tests/quiesced_transition_test.rsawa/tests/cel_callback_test.rscorrectness/run-tlc-suite.shcorrectness/storage/AwaQuiescedTransition.cfgcorrectness/storage/AwaQuiescedTransition.tlacorrectness/storage/AwaQuiescedTransitionUnlocked.cfgdocs/upgrade-0.5-to-0.6.mddocs/upgrade-0.6-to-0.7.mdscripts/compat-matrix.shscripts/compat/run_python.pyskills/awa-operations/SKILL.md
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Inline comments:
In `@awa-python/src/client.rs`:
- Line 2039: Update the async operations around future_into_py so client state
changes occur only after the bridge accepts the operation, or are fully rolled
back when it returns Err. Ensure install_queue_storage does not remain
InstallingQueueStorage, start does not retain Running or its runtime, and
shutdown retains the taken runtime until scheduling succeeds and invokes
runtime.shutdown when accepted.
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.github/workflows/ci.yml.github/workflows/nightly-chaos.yml.github/workflows/release-gate.ymlCHANGELOG.mdawa-model/src/admin.rsawa-python/src/async_bridge.rsawa-python/src/client.rsawa-python/src/job.rsawa-python/src/lib.rsawa-python/src/transaction.rsawa-python/tests/test_interpreter_shutdown.pyawa/tests/cel_callback_test.rscorrectness/evidence/python-shutdown-2026-09-07/README.mdcorrectness/evidence/python-shutdown-2026-09-07/ci-core-backtrace.txtcorrectness/evidence/python-shutdown-2026-09-07/cpython-312-controlled.txtcorrectness/evidence/python-shutdown-2026-09-07/cpython-313-controlled.txtcorrectness/evidence/python-shutdown-2026-09-07/released-wheel.jsonscripts/compat-matrix.shscripts/compat/run_python.pyscripts/compat/shutdown_probe.py
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All six shutdown subprocess tests pass on main CPython 3.12.3/3.14 and backport 3.13. Required build/lint checks pass. Fresh CI/nightly runs are pending. The previously addressed callback review threads are now resolved. |
…robe The rejected-bridge lifecycle regression read the queue-storage schema from runtime_storage_backends, which the shared suite database does not keep in step with the transition state. After test_dlq installs and then drops awa_py_dlq, the row still names it while the runtime resolves the schema from storage_transition_state, so the probe runtime refused to start on CI. Normalise with install_queue_storage(reset=True) like the other runtime suites, so the check depends only on bridge behaviour.
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The published 0.6.2 Python wheel can segfault after its asyncio operation completes because a native completion callback still owns Python objects during interpreter finalization. Awa now fences new bridge work, cancels pending native async tasks, and joins tasks and completion callbacks at atexit with the GIL released. Rejected install/start/shutdown calls leave client lifecycle state unchanged. After five seconds of stalled shutdown, a native stderr diagnostic reports outstanding work while retaining the safety join; returning on timeout would reopen the finalization race. Applications still explicitly shut down workers and close pools.
This also resolves two storage-upgrade caveats without a migration:
mixed_transition, including payload cleanup, lease fencing, transaction rollback and commit-time retry notifications. Finalized routing never falls back (Callback-resolution paths have no canonical fallback during an unfinalized transition #462).storage enter-mixed-transition --quiescedsupports a stopped fleet without a target-runtime witness. It validates the complete target substrate, serializes snapshot writes with the flip, uses millisecond-accurate freshness, and preserves backlog/finalize gates. Operators must keep workers stopped; stale heartbeats are not a process fence (Remove the transition_role=queue_storage_target requirement: re-resolve auto runtimes at the flip, or allow a quiesced-cluster flip #457 proposal 2).#485 carries the library and upgrade fixes onto the 0.6 release line, where unfinalized clusters need them before upgrading to 0.7.
Validation (current head
0d6772ef):c21b3275passed 321 local Python tests and 1,000 exit probes; baseline0d1a9d6passed full CI and the complete nightly. Those earlier results do not certify this latest commit.Native crash evidence and reproduction. Historical schema probes retain pinned wheel bytes and use verified CPython 3.13.12. Current wheels are separately tested on 3.12.3. Child failures fail immediately, with native evidence retained; a completion marker is never a successful process exit.
Fixes #462. Implements #457 proposal 2; live runtime engine switching remains separate. Addresses the Python crash blocker in #383. The published SQLx 0.9 regression remains a separate release blocker.
Summary by CodeRabbit
New Features
--quiescedto support mixed-storage transitions for stopped fleets without a live target runtime.Bug Fixes
Documentation