rustfs/docs/architecture/migration-progress.md

Architecture Migration Progress

Status values: [ ] not started, [~] in progress, [x] complete, [!] blocked.

Current Context

• Issue: rustfs/backlog#660
• Branch: overtrue/arch-startup-timeline
• Baseline: upstream/main at ae9d25879d72bc8977f08e61062c022e2142483b
• PR type for this branch: docs-only
• Runtime behavior changes: none
• Rust code changes: none
• Docs changes: add the binary startup timeline baseline for later runtime/lifecycle migration work.

Phase 0 Tasks

• G-001 Refresh main and record baseline.
  • Acceptance: baseline commit, title, and branch are recorded.
  • Verification: git fetch upstream main --prune; git rev-parse upstream/main.
• G-002 Create migration tracking checklist.
  • Acceptance: this file records task state, context, verification, and handoff.
• G-003 Classify PR types.
  • Acceptance: crate-boundaries.md lists exactly one allowed PR type per PR.
• G-004 Define re-export and wrapper policy.
  • Acceptance: temporary compatibility code must use RUSTFS_COMPAT_TODO.
• G-005 Add dependency direction guard.
  • Acceptance: ./scripts/check_layer_dependencies.sh passes on current upstream/main while still rejecting new unaccepted layer dependencies.
• [~] G-006 Create migration loss-prevention checks.
  • Current branch: not in scope.
  • Next PR: add checks for public re-export, route matrix, and storage trait coverage before pure moves.
• G-007 Create startup timeline table.
  • Acceptance: startup-timeline.md records current binary startup order, side effects, fatal boundaries, and readiness stages.
• G-009 Enforce pre-push three-expert review.
  • Acceptance: crate-boundaries.md requires quality/architecture, migration-preservation, and testing/verification review before push.
• [~] TEST-PRTYPE-001 Check PR type enum consistency.
  • Current branch: not in scope.
  • Next PR: add a mechanical check that all migration docs use the same PR type vocabulary.

Next PRs

1. docs-only or test-only: capture admin route-action snapshot.
2. docs-only: inventory ecstore::config::{Config, KV, KVS} consumers.
3. ci-gate: add focused checks for PR type vocabulary and temporary compatibility marker/register consistency.

Pre-Push Review Log

Expert	Status	Notes
Quality/architecture	pass	Final review confirmed the startup, deferred IAM, readiness, and shutdown tables match current source behavior after blocker fixes
Migration preservation	pass	Final review confirmed this branch is docs-only and does not touch runtime logic, storage hot paths, global-state migration, or compatibility code
Testing/verification	pass	Final review accepted docs-only verification with layer guard, metrics reference guard, diff checks, and staged whitespace check

Verification Notes

Passed:

• ./scripts/check_layer_dependencies.sh
• ./scripts/check_metrics_migration_refs.sh
• git diff --check
• git diff --cached --check
• focused source review of rustfs/src/main.rs, rustfs/src/startup_iam.rs, and rustfs/src/server/readiness.rs

Handoff Notes

• Keep Phase 0 PRs small. Do not start Config, Storage API, Runtime, or ECStore movement inside this docs-only branch.
• Keep CI checks in a separate ci-gate PR so the PR type rule remains enforceable.
• Do not add temporary compatibility code without a matching RUSTFS_COMPAT_TODO(<task-id>) marker and cleanup-register entry.