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3fb6fa35d5
PR 2a of the MR-668 multi-graph server work. Bug fix: a partially-failed
`Omnigraph::init` previously left orphan schema files at the graph URI,
making the URI unusable for a retry (the next `init` would refuse because
`_schema.pg` already exists).
Changes:
1. `init_with_storage` now wraps the I/O phase. On any error from
`init_storage_phase`, calls `best_effort_cleanup_init_artifacts` to
remove the three schema files before returning the original error:
- `_schema.pg`
- `_schema.ir.json`
- `__schema_state.json`
Cleanup is best-effort: a failure to delete is logged via
`tracing::warn` but does NOT mask the init error.
2. Three failpoints added at the init phase boundaries:
- `init.after_schema_pg_written`
- `init.after_schema_contract_written`
- `init.after_coordinator_init`
3. Four new failpoint tests in `tests/failpoints.rs` pin the cleanup
behavior at each boundary plus the "original error wins over cleanup
error" contract. All 23 failpoint tests pass.
Coverage gap (documented in code comments):
Lance per-type datasets and `__manifest/` directory created by
`GraphCoordinator::init` are NOT cleaned up after a coordinator-init-phase
failure. Recursive directory deletion requires `StorageAdapter::delete_prefix`,
which was deferred along with `DELETE /graphs/{id}` (originally PR 2b). When
that primitive lands, the third failpoint test can be tightened to assert
the graph root is fully empty.
Tests: 4 new (init_failpoint_*), all 23 failpoint tests green. No
regression in the 105 engine library tests or 64 end_to_end tests.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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