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feat: add scheduler workload admission contracts (#3602)
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@@ -104,6 +104,10 @@ Required `rustfs-storage-api` public re-exports:
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- `pub use object::{VersionMarker, WalkOptions, WalkVersionsSortOrder};`
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- `pub use topology::{DiskCapabilities, TopologyCapabilities, TopologyDisk, TopologyLabels, TopologyPool, TopologySet, TopologySnapshot, TopologySnapshotProvider};`
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Required `rustfs-concurrency` public workload admission contract re-exports:
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- `pub use workload::{AdmissionState, WorkloadAdmissionRegistrySnapshot, WorkloadAdmissionSnapshot, WorkloadAdmissionSnapshotProvider, WorkloadClass};`
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ECStore must keep compile-time coverage for `StorageAdminApi`, `HealOperations`,
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and the separate `NamespaceLocking` operation group.
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@@ -5,19 +5,19 @@ Status values: `[ ]` not started, `[~]` in progress, `[x]` complete, `[!]` block
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## Current Context
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- Issue: [`rustfs/backlog#660`](https://github.com/rustfs/backlog/issues/660)
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- Branch: `overtrue/arch-observability-topology-contracts`
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- Branch: `overtrue/arch-scheduler-workload-contracts`
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- Baseline: stacked on `origin/overtrue/arch-test-harness-compat-aliases`
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after `rustfs/rustfs#3600`
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(`ae6a5befcf60f2f2ebce9799ba93649032234273`).
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- PR type for this branch: `contract`
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after `rustfs/rustfs#3601`
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(`dc099f415670d94c0f79a7f9015653a08cdf458f`).
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- PR type for this branch: `test-only` plus `contract`
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- Runtime behavior changes: none.
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- Rust code changes: add observability and topology capability DTO/trait
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contracts to `rustfs-storage-api`.
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- CI/script changes: extend migration re-export guard coverage for the new
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contract exports.
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- Rust code changes: add scheduler preservation tests and workload admission
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contract types to `rustfs-concurrency`.
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- CI/script changes: extend migration re-export guard coverage for workload
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admission contract exports.
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- Docs changes: add
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[`runtime-capability-contracts.md`](runtime-capability-contracts.md) and
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record the combined PR-08/API-013 plus PR-09/API-014 contract slice.
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[`workload-admission-contracts.md`](workload-admission-contracts.md) and
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record the combined PR-05/TEST-SCH-001 plus PR-07/R-015 slice.
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## Phase 0 Tasks
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@@ -119,6 +119,31 @@ Status values: `[ ]` not started, `[~]` in progress, `[x]` complete, `[!]` block
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plus supported, unsupported, unknown, and disabled capability states;
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focused storage-api check; migration guard; formatting; diff hygiene; and
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three-expert review.
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- [x] `PR-05/TEST-SCH-001` Add scheduler preservation tests.
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- Completed slice: pin worker over-release clamping, reusable scheduler
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default thresholds and priority boundaries, backpressure pipe metadata
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reads, and get-object queue snapshot saturation/zero-total semantics.
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- Acceptance: current reusable scheduling and admission-facing behavior is
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covered before later read-only snapshot extraction.
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- Must preserve: scheduler algorithm, queue capacity, threshold defaults,
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Tokio runtime settings, request admission, scanner admission, heal
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admission, replication admission, and background task admission behavior.
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- Verification: focused concurrency tests, focused concurrency check,
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migration guard, formatting, diff hygiene, and three-expert review.
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- [x] `PR-07/R-015` Add runtime workload class contract.
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- Completed slice: add `WorkloadClass`, `AdmissionState`,
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`WorkloadAdmissionSnapshot`, `WorkloadAdmissionRegistrySnapshot`, and
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`WorkloadAdmissionSnapshotProvider` to `rustfs-concurrency`.
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- Acceptance: foreground read, foreground write, metadata, scanner, repair,
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and replication workload classes are representable through read-only
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admission registry snapshots without ECStore dependency.
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- Must preserve: no SchedulerManager decision logic, Tokio worker defaults,
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scanner/heal admission behavior, replication admission behavior, cluster
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scheduling, placement, membership, or business call-site migration.
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- Verification: workload contract unit tests, focused concurrency check,
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migration guard, formatting, diff hygiene, and three-expert review.
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- [x] `TEST-PRTYPE-001` Check PR type enum consistency.
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- Acceptance: `./scripts/check_architecture_migration_rules.sh` parses the
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allowed PR types from [`crate-boundaries.md`](crate-boundaries.md) and fails
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@@ -1704,7 +1729,9 @@ Status values: `[ ]` not started, `[~]` in progress, `[x]` complete, `[!]` block
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1. `contract`/`consumer-migration`: wire read-only observability and topology
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snapshots to implementation owners without changing runtime, profiling,
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placement, or admin route behavior.
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2. `pure-move`/`consumer-migration`: continue larger cleanup slices with the
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2. `api-extraction`: expose the set-local scheduler snapshot after the
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TEST-SCH-001 and R-015 protection/contract slice.
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3. `pure-move`/`consumer-migration`: continue larger cleanup slices with the
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loss-prevention guards active for remaining ECStore compatibility contracts
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now that broad compatibility passthroughs are fully closed.
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@@ -1712,14 +1739,24 @@ Status values: `[ ]` not started, `[~]` in progress, `[x]` complete, `[!]` block
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| Expert | Status | Notes |
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|---|---|---|
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| Quality/architecture | passed | S-015 removes obsolete KMS admin policy action variants after the handler fallback cleanup; API-042/API-043/API-044/API-045/API-046/API-047/API-048/API-049/API-050/API-051/API-052/API-053/API-054 narrow notify, S3 Select, OBS, IAM, Swift, heal, scanner, RustFS runtime, test, fuzz, lifecycle helper, harness, and RustFS runtime compatibility contracts without moving ECStore storage metadata ownership; G-011/G-012/G-013 add docs-only baselines for scheduler, placement/repair, and profiling/NUMA work; Issue #660 PR-08/PR-09 add read-only observability and topology contracts in rustfs-storage-api only. |
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| Migration preservation | passed | KMS endpoint URLs, query aliases, request bodies, response contracts, and dedicated `kms:*` authorization behavior are preserved; event builder call sites, ECStore event bridge conversion, restore event data, version IDs, metadata filtering, config read/save semantics, S3 Select store/error/buffer semantics, OBS metrics state reads, IAM config/notification/error semantics, Swift bucket metadata access, heal disk/resume/task behavior, scanner lifecycle/replication/data-usage behavior, RustFS startup/admin/app/storage runtime access, e2e/test/fuzz import behavior, lifecycle expiration/transition helper DTO field contracts, flattened harness and RustFS runtime scalar/secondary alias behavior, unchanged no-op handling, remove-event behavior, scheduler/readiness/placement/profiling runtime behavior, platform gates, missing/unknown capability states, and placement/topology labels are preserved. |
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| Testing/verification | passed | Focused compiles/tests, fuzz target compile, guards, formatting, diff hygiene, risk scan, and full `make pre-commit` passed for prior code slices; current Issue #660 PR-08/PR-09 contract slice uses storage-api tests/checks, migration guard, formatting, diff hygiene, and three-expert review. |
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| Quality/architecture | passed | S-015 removes obsolete KMS admin policy action variants after the handler fallback cleanup; API-042/API-043/API-044/API-045/API-046/API-047/API-048/API-049/API-050/API-051/API-052/API-053/API-054 narrow notify, S3 Select, OBS, IAM, Swift, heal, scanner, RustFS runtime, test, fuzz, lifecycle helper, harness, and RustFS runtime compatibility contracts without moving ECStore storage metadata ownership; G-011/G-012/G-013 add docs-only baselines for scheduler, placement/repair, and profiling/NUMA work; Issue #660 PR-08/PR-09 add read-only observability and topology contracts in storage-api only; current PR-05/PR-07 slice adds scheduler preservation tests and a small workload admission contract in concurrency only. |
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| Migration preservation | passed | KMS endpoint URLs, query aliases, request bodies, response contracts, and dedicated `kms:*` authorization behavior are preserved; event builder call sites, ECStore event bridge conversion, restore event data, version IDs, metadata filtering, config read/save semantics, S3 Select store/error/buffer semantics, OBS metrics state reads, IAM config/notification/error semantics, Swift bucket metadata access, heal disk/resume/task behavior, scanner lifecycle/replication/data-usage behavior, RustFS startup/admin/app/storage runtime access, e2e/test/fuzz import behavior, lifecycle expiration/transition helper DTO field contracts, flattened harness and RustFS runtime scalar/secondary alias behavior, unchanged no-op handling, remove-event behavior, scheduler/readiness/placement/profiling runtime behavior, platform gates, missing/unknown capability states, placement/topology labels, scheduler thresholds, queue snapshot semantics, and admission behavior are preserved. |
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| Testing/verification | passed | Focused compiles/tests, fuzz target compile, guards, formatting, diff hygiene, risk scan, and full `make pre-commit` passed for prior code slices; current Issue #660 PR-05/PR-07 slice uses concurrency tests/checks, migration guard, formatting, diff hygiene, and three-expert review. |
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## Verification Notes
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Passed before push:
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- Issue #660 PR-05/PR-07 current slice:
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- `cargo test -p rustfs-concurrency --no-fail-fast`: passed.
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- `cargo check -p rustfs-concurrency`: passed.
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- `./scripts/check_architecture_migration_rules.sh`: passed.
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- `./scripts/check_layer_dependencies.sh`: passed.
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- `cargo fmt --all --check`: passed.
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- `git diff --check`: passed.
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- `make pre-commit`: passed.
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- Three-expert review: passed.
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- Issue #660 PR-08/PR-09 current slice:
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- `cargo test -p rustfs-storage-api`: passed.
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- `cargo check -p rustfs-storage-api`: passed.
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@@ -0,0 +1,43 @@
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# Workload Admission Contracts
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This document records the `rustfs/backlog#660` PR-05 and PR-07 scheduler
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preservation and runtime workload-class contract slice.
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## Preservation Coverage
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The `rustfs-concurrency` tests pin the current reusable scheduler and
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admission-facing behavior before later snapshot extraction:
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- Worker slot over-release remains clamped by the configured worker limit.
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- Scheduler default buffer and priority thresholds remain unchanged.
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- Scheduler priority boundaries remain high below the high threshold, normal at
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both thresholds, and low above the low threshold.
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- Backpressure pipe metadata reads preserve buffer capacity and state without
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mutating the manager state.
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- `GetObjectQueueSnapshot` preserves saturated, over-available, and zero-total
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permit semantics.
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## Workload Class Contract
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`WorkloadClass` defines the required future admission categories:
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- Foreground read.
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- Foreground write.
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- Metadata.
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- Scanner.
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- Repair.
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- Replication.
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`AdmissionState`, `WorkloadAdmissionSnapshot`, and
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`WorkloadAdmissionRegistrySnapshot` define read-only status shapes for later
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runtime owners. They do not replace the current scheduler, request guard,
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scanner, heal, replication, or ECStore placement behavior.
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## Boundary Rules
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- `rustfs-concurrency` owns this reusable contract surface.
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- The contract does not depend on `rustfs-ecstore` or RustFS binary runtime
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state.
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- No scheduler decision logic, queue capacity, Tokio runtime default, scanner
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admission, heal admission, replication admission, placement, membership, or
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NUMA behavior changes are part of this slice.
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