Stores now support non-exact upload sizes & S3 store optimizations by allada · Pull Request #11 · TraceMachina/nativelink

allada · 2021-11-05T04:16:40Z

S3 store now is optimized and can upload multiple parts concurrently.
Non-exact upload sizes is supported for a follow-up change which
will allow compression to and from backend stores.

This change is

allada

Reviewed 29 of 32 files at r1, 5 of 7 files at r2, 1 of 1 files at r3.
Reviewable status: 34 of 35 files reviewed, all discussions resolved (waiting on @allada)

S3 store now is optimized and can upload multiple parts concurrently. Non-exact upload sizes is supported for a follow-up change which will allow compression to and from backend stores.

allada

Reviewed 1 of 7 files at r2.
Reviewable status: 32 of 35 files reviewed, all discussions resolved (waiting on @allada)

…raceMachina#12/TraceMachina#13/TraceMachina#14: minor cleanups + boundary/mode tests TraceMachina#8 (MINOR) — `fits()` defensive: added `(Some(_), Some(0)) => true` arm so a future code path that records a stale `(used, 0)` cannot lock the peer out of all picker rotations. Sits before the main `<=` arm. TraceMachina#9 (MINOR) — Reverted visibility widening on `BlobsAvailableState::fs_store` and `cas_server_fss` to private. Only consumer is in the same module (`local_worker.rs`). TraceMachina#11 (MINOR) — Replaced hand-rolled temp paths in `blobs_in_stable_storage_handler_test.rs` and `download_to_directory_mirror_test.rs` with `tempfile::Builder`. `.keep()` disarms auto-cleanup so the FilesystemStore (lives past the test body inside Arcs) doesn't see its content_path vanish mid-run. TraceMachina#12 (MINOR) — Inlined `pick_mirror_endpoint` wrapper and renamed `pick_mirror_endpoint_for_size` → `pick_mirror_endpoint`. The wrapper was only used by tests (not prod) and the duplication added cognitive load. All 5 test sites updated to pass `0` for size_bytes (preserves pre-fix behavior of disabling capacity filter). TraceMachina#13 (MINOR) — Added `test_fits_at_exact_boundary_returns_true`. Uses two peers — "a" exactly at boundary, "b" with room — and asserts the picker round-robins both. Mutate-verified: changing `<=` to `<` in `fits()` makes the test FAIL (only "b" gets picked). TraceMachina#14 (MINOR, Linux-only) — Added `mirror_materialize_sets_0o555_mode_on_disk`. Builds a FastSlowStore whose fast tier is a real FilesystemStore, runs the mirror-materialize path, then asserts the on-disk file's mode is exactly 0o555 via `digest_content_path`. Guards against a regression where the mirror-materialize path bypasses or post-overwrites the canonical CAS read-execute mode. cargo check --all-targets clean. mirror_durability_test: 15/15 pass (was 14). worker_proxy_store unit tests: 31/31 pass (was 30). Pre-existing unrelated failures in `bytestream_server_test` (locality_stale_evicts_and_ingests, locality_timeout_falls_through_without_eviction, write_too_many_bytes_fails) and `existence_store_test` (copes_with_dropped_items) are NOT caused by this commit — they fail identically on parent 70b2f59. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

…Machina#2+TraceMachina#3+TraceMachina#5+TraceMachina#9+TraceMachina#11 (BLOCK-class) Addresses 6 of 11 reviewer findings on the BlobsAvailable chunking landing (PR3 of TraceMachina#80). Each fix is annotated with the originating reviewer + finding ID. ACCUMULATOR (nativelink-service/src/blobs_available_accumulator.rs): * Fix TraceMachina#1 (invariant-prover BLOCK + dsr + code-reviewer): Add sequence-completeness gate at terminal commit. Before this fix, a terminal chunk arriving with gaps in `seen_sequences` committed a strict-subset partial — the half-applied-snapshot bug class the Path A semantics are meant to prevent. The new `BroadcastAccumulator::sequences_contiguous()` checks `seen_sequences == (1 << (max_seen_sequence + 1)) - 1`. On rejection: drop the partial accumulator, increment `dropped_incomplete_sequence` counter, warn-log, return None. Worker re-broadcasts on next tick. * Fix TraceMachina#3 (red-team BLOCK + testing-czar IMP-4 + assumption-auditor REFUTED-1): Header scalars (worker_cas_endpoint, cpu_load_pct, mirror_used_bytes, etc.) now stored as `Option<HeaderScalars>`, populated only when `sequence == 0` arrives. If the terminal commits without seq=0 ever arriving, refuse (subsumed by Fix TraceMachina#1 in practice but documented separately). `BroadcastAccumulator::new()` no longer reads scalars from "first chunk to arrive" — that path silently lost headers under out-of-order delivery. * Fix TraceMachina#2 (dsr BLOCK-1 + red-team alt 1): Raise MAX_SEQUENCES from 64 → 256 (bitset switched from u64 to u128-pair) AND MAX_ACCUMULATED_ENTRIES_PER_CONN from 200_000 → 1_000_000 to match the AC-pin per-endpoint cap of 1M. Worker FSS sizing 50K- 200K + AC pins + cached_directory_digests easily reaches 1M total; the prior 200K cap silently dropped legitimate worker traffic. * Fix TraceMachina#11 (security M1 + assumption-auditor REFUTED-2): - Pre-merge per-conn entries-cap projection: cap fires BEFORE `acc.merge(chunk)` so peak accumulator memory is bounded by `MAX_ACCUMULATED_ENTRIES_PER_CONN + MAX_ENTRIES_PER_CHUNK`, not `+ (one hostile chunk's worth)`. - Per-chunk entries cap (`MAX_ENTRIES_PER_CHUNK = 8192`): rejects oversized chunks before any per-broadcast state is touched. - Falsification test `entries_cap_drops_partial_at_2x_threshold`: drives 2× the cap of synthetic data, asserts cap eviction fires AT threshold (not far before, not after OOM). * Fix TraceMachina#9 (dsr MAJOR-1): Per-reason `chunks_dropped_*` counters exposed via `pub drop_counts: ChunkDropCounts`. 9 reasons: token_zero, token_mismatch, per_conn_broadcasts_cap, per_conn_entries_cap, per_chunk_entries_cap, sequence_cap, validation_other, incomplete_sequence, missing_chunk_zero. Each warn-log carries the reason as a structured field. Test `drop_counters_cover_all_documented_reasons` exercises 7 of 9 paths (the two missing-chunk-zero paths are structurally unreachable when the completeness gate fires first; counter exists for defense-in-depth). * Fix TraceMachina#5 (invariant-prover + assumption-auditor): Replaced `out_of_order_sequence_within_window_tolerated` with `out_of_order_sequence_with_gap_rejected`. The old test ENSHRINED THE BUG by asserting `is_some()` on a commit that skipped sequence 1 — the new test asserts `is_none()` with the bespoke message "sequence-completeness gate must reject incomplete commit; saw is_some() instead — Fix TraceMachina#1 (invariant-prover BLOCK) regression". * Removed gratuitous `total_accumulated: AtomicUsize` (code-reviewer TraceMachina#4): always accessed under the inner mutex; reduced to a plain `usize` field on `AccumulatorInner`. Adds a `total_accumulated()` test helper. CHUNKER (nativelink-util/src/blobs_available_chunking.rs): * Fix TraceMachina#2 (dsr BLOCK-1): Added `BLOBS_AVAILABLE_MAX_CHUNKS_PER_BROADCAST = 256` MUST-equal-the- server-MAX_SEQUENCES constant. Changed `chunk_blobs_available()` signature from `Vec<...>` to `Result<Vec<...>, &'static str>`. Returns Err if a broadcast would emit > 256 chunks. New tests: `chunker_errors_when_exceeding_max_chunks_per_broadcast` and `chunker_allows_exact_max_chunks_per_broadcast` (boundary). WORKER (nativelink-worker/src/local_worker.rs): * `send_periodic_blobs_available` updated to handle the chunker's new Result return: on Err, warn-log and return Ok(()) (skip the tick; next tick retries). Better than emitting chunks the server silently discards. INVARIANTS WALKED: * terminal-chunk-commits ⇒ seen_sequences forms contiguous prefix [0, max_seen_sequence] (Fix TraceMachina#1 — re-established at blobs_available_accumulator.rs `sequences_contiguous()`). * per-conn memory bound: `total_accumulated <= MAX_ACCUMULATED_ENTRIES_PER_CONN + MAX_ENTRIES_PER_CHUNK` even with a hostile chunk (Fix TraceMachina#11 — re-established at pre-merge cap-check). * chunker output count <= BLOBS_AVAILABLE_MAX_CHUNKS_PER_BROADCAST = server's MAX_SEQUENCES (Fix TraceMachina#2 — enforced at chunker producer-side guard). TESTS: * nativelink-util chunker: 11/11 pass (added 2 tests). * nativelink-service accumulator: 19/19 pass (added 7 tests, rewrote 1, removed 0). Reviewers cited: invariant-prover BLOCK, distributed-systems-reviewer BLOCK-1 + MAJOR-1, red-team blind-spot-1 + alt-1 + alt-2, testing-czar IMP-2 + IMP-3 + IMP-4, code-reviewer Critical TraceMachina#1 + suggestion TraceMachina#4, assumption-auditor REFUTED-1 + REFUTED-2, security-reviewer M1 + M2. Composite invariants this fix interacts with: Path A (deferred-wipe) commit semantics, mirror_blobs ≥2-replica durability (untouched — BlobsAvailable is locality hint only), worker_instance_token contract from TraceMachina#97/TraceMachina#98. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

…ns + T9 pin order Cadre fix-up B3+B4+B5+T9+N1+N2 for the chunked_b1_writev_test.rs and a stale module doc-comment in chunked_writer.rs. B3 — io_uring skip-guards: every Path-A test now calls `skip_if_no_io_uring(test_name)` at entry; non-Linux / non-io-uring hosts log a SKIP and return. Without the guard, Path B (spawn_blocking) was silently exercised and tests "passed" for the wrong reason — invariants like T4's "different digests parallelize" became tautologies on the spawn_blocking path. B4 — index-visibility assertions: replaced `let _ = results` discards at T1 and T_multi with a new `assert_index_visible` helper that: - passes a real `&mut [Option<u64>; 1]` slot, - awaits has_with_results within a 5 s window, - panics with bespoke "stale negative — index not updated post-rename" when results[0] is None, - asserts the size matches the expected blob size. Mutation target named in the panic message per CLAUDE.md `feedback_index_visibility_contract` (2026-05-04). B5 — T2 doc-comment: updated the stale "Mutation target" framing from the prior coalesce-strict-< form (which can never fire under COALESCE_TARGET == CHUNK_SIZE == 1 MiB) to match the design's §1/§4 load-bearing-win framing (io_uring bypass of the spawn_blocking pool mutex, NOT coalescing amortization). Steady state IS one writev per chunk; histogram inversion is the actual contract bug to guard. T9 — pin-ordering correctness (cadre fix-up P1 falsification): new `b1_writev_pin_only_advertises_post_cqe_bytes`. Injects writer error BEFORE the first writev (N=0 trigger fires on writev_submit_count >= 0 immediately), so NO chunk's writev CQE returns Ok. Asserts `driver.pinned_chunk_count() == 0` and `driver.pinned_bytes() == 0`. Mutation: comment out the populate inside `process_completion`'s Ok-arm AND restore the driver-site populate unconditionally; T9 red-fails with the bespoke "pin advertised bytes before writev completed" message. (Mutation verification step run in follow-up.) N1 — chunked_writer.rs stale module doc-comment ("Phase status (2026-06-03)") updated: wire-up, marker, helper, T1/T_multi/T_drop/ T2/T4/T5/T6/T7/T8 are all landed; cadre fix-up adds T9. N2 — `use core::pin::Pin;` moved to the top `use` block (was inline at the test body in the previous diff). N3 (perf TraceMachina#11 hit_eof cleanup) — skipped: hit_eof is used for the post-error post-EOF control flow in step 4. The proposed `while chunk_rx.recv().await.is_some() {} break;` cleanup would fast-forward to step 7's drain, which already exists; the duplication is a NIT and the proposed change risks correctness regression in T8. All 9 tests pass (T1, T_multi, T_drop, T2, T4, T5, T6, T7 unit pair, T8, T9) on buildcache (Linux + io-uring kernel). Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

…CacheStore construction Invariant: an ECS over a registered-but-ref-wrapped backend must register its invalidation callback (the ECS stale-positive triangle's eviction corner). Violated: ECS::new_with_time queried supports_removal_callbacks() on a freshly-created RefStore (cell=None) — false-for-unresolved (e8b1498/TraceMachina#367, deliberate, preserved) latched vulnerable_mode=true at EVERY boot of this binary+config; AC_INNER's eager-invalidation callback was never registered on REDIS_AC_STORE (1 of 2 callbacks). Plausibly present since the config landed ~May 11 (pre-deploy journal retention prevented earlier detection). Fix: explicit inner_store(None) resolution before the query — mirrors what FastSlowStore::new_validated does accidentally at :1445. distsys traced the post-fix composite end-to-end: callback registers on the memory tier immediately and deferred-replays onto REDIS_AC_STORE at first Redis op (notifications default-on). Boot-order safe (declaration order + graceful degradation on missing names — guarded by test). Tests: TDD red-verified (timestamp-proven chain) + mutation red with bespoke 'TraceMachina#9' message; missing-name negative-contract test; callback liveness via eviction→ECS-clear with timeout-pattern poll. [[test]] required-features stanza added (testing-czar BLOCK — plain cargo test refused clearly instead of E0599). Guard comment added on RefStore::supports_removal_callbacks against future auto-resolve cleanup. Reviewers 7/7 (records .claude/reviews/acbb767d-ecs-fix/): perf/code/ auditor/security/distsys/red-team landable; testing-czar BLOCK closed in review batch. Follow-ups: TraceMachina#10 (FastSlow sibling), TraceMachina#11 (callback-chain observability: vulnerable_mode=0 can mask a dead chain; FastSlow capability honesty; metric help-text; get_store-abort edge; production-shape propagation test). Behavior changes: AC_INNER ECS registers eager invalidation at boot; the startup vulnerable_mode ERROR no longer fires for ref-wrapped registered backends. Closes TraceMachina#9. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

…k-chain correctness (ECS/FSS/RefStore) ## Invariant Walk Invariant being violated: A store reporting supports_removal_callbacks()==true must actually fire callbacks on every eviction observable to the composite; any composition layer that returns true unconditionally without querying its inner stores leaves ECS in a false-safe state where vulnerable_mode=false but no callbacks ever fire. Mechanism that violates it: - fast_slow_store.rs: no supports_removal_callbacks override → trait default `true` inherited unconditionally; ECS(FastSlow{*, GrpcStore}) would see supports=true, register a dead callback, and never fire on GrpcStore-side evictions. - fast_slow_store.rs:756-area register_slow_eviction_stable_set_listener called supports_removal_callbacks() on a possibly-unresolved RefStore; an unresolved RefStore returns false by design (e8b1498/TraceMachina#367 contract), so the BIS listener would log a false warn and skip registration. - ref_store.rs:get_store loop: `store.register_item_callback(callback)?` returned Err WITHOUT writing the cell — permanently bricking the RefStore; every subsequent op re-entered the slow path and failed forever. Mechanism that re-establishes it after the fix: - fast_slow_store.rs: new supports_removal_callbacks override resolves both tier stores via inner_store(None) before querying, then returns fast.supports() && slow.supports(); ECS gets the correct composite answer. - fast_slow_store.rs:register_slow_eviction_stable_set_listener: calls slow_store.inner_store(None) before supports_removal_callbacks(), forcing RefStore cell population so the capability query sees the resolved store. - ref_store.rs:get_store: writes the cell BEFORE replaying callbacks; replay Err is logged + counted but resolution is considered succeeded (degraded, not bricked). Composite invariants this fix interacts with: - ECS vulnerable_mode triangle: gate (supports=false → vulnerable_mode=true) OR eager-invalidation-via-callback; fix ensures the gate correctly reflects whether callbacks can fire end-to-end. - BIS listener registration: BIS ack requires the stable-set callback path fires on every slow-tier eviction; TraceMachina#10 fix ensures direct FastSlowStore::new callers with ref-wrapped slow stores don't silently lose the listener. - RefStore resolution contract: after get_store() returns Ok, the cell is permanently written and all ops delegate to the resolved store even if callback replay partially failed. Test that proves the fix re-establishes the invariant: - capability_query_callback_chain_test.rs (all 9 tests, 0 failures): - fast_slow_supports_callbacks_false_when_slow_does_not (TraceMachina#11 Item 2) - fast_slow_supports_callbacks_true_when_both_tiers_support (TraceMachina#11) - fast_slow_supports_callbacks_true_when_slow_ref_resolves_to_memory (TraceMachina#11) - ref_store_get_store_not_bricked_by_callback_replay_failure (TraceMachina#11 Item 5) - ecs_over_ref_fast_slow_slow_tier_eviction_clears_cache (TraceMachina#11 Item 6) - ecs_invalidation_callbacks_fired_counter_increments (TraceMachina#11 Item 3) - fast_slow_new_ref_wrapped_slow_registers_bis_listener (TraceMachina#10) - ecs_over_fss_no_callback_slow_enters_vulnerable_mode (TraceMachina#11 Item 2 over-action) - fss_supports_callbacks_false_when_fast_does_not_and_rule (TraceMachina#11 AND-rule pin) ## Changes ### Item 1 (TraceMachina#10) — resolve RefStore before BIS listener capability query fast_slow_store.rs: `register_slow_eviction_stable_set_listener` calls `slow_store.inner_store(None::<StoreKey<'_>>)` before `supports_removal_callbacks()`. Forces RefStore cell population so the unresolved-cell false-return doesn't trigger a misleading warn. ### Item 2 (TraceMachina#11) — FastSlowStore supports_removal_callbacks honesty New `StoreDriver::supports_removal_callbacks` override on FastSlowStore resolves both tiers via `inner_store(None)` then returns `fast.supports() && slow.supports()`. Pre-fix: trait default `true` inherited unconditionally. AND rule is over-conservative for ECS stale- positive prevention (slow-only suffices) but kept as defense-in-depth. ### Item 3 (TraceMachina#11) — ECS invalidation_callbacks_fired counter New `CounterWithTime` field on ExistenceCacheStore, incremented in the ExistenceCacheCallback::callback path when a cache entry is actually removed. Metric counts evictions from ANY registered tier (fast-tier LRU churn AND slow-tier evictions); nonzero does NOT prove slow-tier chain is alive; zero over a churn window with active writes is the meaningful dead-chain signal. ### Item 4 (TraceMachina#11) — vulnerable_mode metric help-text correction Updated metric help to describe the actual condition (construction-time supports_removal_callbacks()==false) rather than the incorrect prior text ("register_item_callback failed at construction"). ### Item 5 (TraceMachina#11) — RefStore cell-write-before-replay no-brick fix ref_store.rs:get_store: writes the cell unconditionally before the callback replay loop. Replay errors are degradations (log + counter), not failures. New `callback_replay_failures: AtomicU64` metric field. ### Item 6 (TraceMachina#11) — Production-shape propagation test New test `ecs_over_ref_fast_slow_slow_tier_eviction_clears_cache` exercises the full AC-chain shape: ECS(RefStore→FastSlow{Memory, Memory}). Verifies slow-tier eviction propagates via FastSlow fanout to ECS cache removal within a 3-second deadline. ## AND Rule: Invariant + Correctness FSS.supports_removal_callbacks() returns fast.supports() && slow.supports(). Only slow-tier evictions create ECS stale positives (fast-tier eviction while slow still holds the blob = false negative, self-correcting). So slow.supports() alone is sufficient; AND is defense-in-depth. A future fast tier returning supports=false (e.g. WorkerProxyStore) would put ECS in vulnerable_mode=true unnecessarily; revisit the rule then. ## Behavior Changes FastSlowStore::supports_removal_callbacks: prior → new FastSlow{Memory, Memory}: true (default) → true (explicit; no change) FastSlow{Memory, GrpcStore}: true (default, wrong) → false (correct) GrpcStore.supports=false per ce4d2ec/TraceMachina#367 original commit (grpc_store.rs:3468) FastSlow{Memory, RefStore(Memory)}: true (default) → true (after resolve) FastSlow{Memory, NoCallbackStore}: true (default, wrong) → false (correct) Production compositions (verified against /srv/nativelink/buildcache-native.json5): cas_FAST_SLOW_STORE = FSS{MemoryStore, FilesystemStore} (line 111-140) fast = plain MemoryStore (not SizePartitioningStore; SPS lives at cas_INNER level as the ECS backend). fast.supports=true, slow.supports=true. Composite stays true. No behavior flip. No ECS wraps directly. AC_BACKEND_CACHED = FSS{MemoryStore, RefStore(RedisStore)} (line ~66-area) Redis slow (enable_keyspace_notifications default true): composite stays true. NO flip. vulnerable_mode stays false, matching TraceMachina#9 deploy verification (vulnerable_mode=0). SMALL_CAS_CACHED = FSS{MemoryStore, RefStore(REDIS_CAS_SMALL)} (line 206-220) keyspace default true → composite true. No flip. Mutations verified red: MUTATION-1 (TraceMachina#10 inner_store resolution): observability-only — no behavioral falsifier exists; the callback fires via RefStore queuing regardless; the fix corrects which warn arm fires. No mutation evidence claimed. MUTATION-2: remove supports_removal_callbacks from FastSlowStore → tests fast_slow_supports_callbacks_false_when_slow_does_not, ecs_over_fss_no_callback_slow_enters_vulnerable_mode, fss_supports_callbacks_false_when_fast_does_not_and_rule all fail with bespoke messages. MUTATION-3: remove invalidation_callbacks_fired.inc() → test ecs_invalidation_callbacks_fired_counter_increments fails with bespoke "TraceMachina#11: invalidation_callbacks_fired counter did not increment after eviction" MUTATION-5: re-add `return Err(err)` in replay loop → test ref_store_get_store_not_bricked_by_callback_replay_failure fails with bespoke "TraceMachina#11: ref bricked by callback replay failure" MUTATION (new test a): revert supports_removal_callbacks to true → ecs_over_fss_no_callback_slow_enters_vulnerable_mode red-fails with bespoke "TraceMachina#11 over-action: ECS(FSS{Mem, NoCallback}) must enter vulnerable_mode=true..." MUTATION (new test b): flip AND to || → fss_supports_callbacks_false_when_fast_does_not_and_rule red-fails with bespoke "TraceMachina#11 AND-rule: FSS{NoCallback-fast, Memory-slow}.supports() must be false..." Cargo churn: tokio-epoll-uring exclude (Cargo.toml) + assert-panic/os_pipe removals from Cargo.lock were NOT required for this branch to build (verified: cargo check -p nativelink-store clean without exclude); reverted. Bench scope: observability + callback-path (not data-plane hot path). Exempt from data_plane_bench per CLAUDE.md (no ByteStream/FastSlow/FilesystemStore hot-path changes). Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

allada force-pushed the s3-store-supports-estimates-and-buffers branch 2 times, most recently from dac98fa to f6da5ed Compare November 5, 2021 04:25

allada commented Nov 5, 2021

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Stores now support non-exact upload sizes & S3 store optimizations

6a9b50e

S3 store now is optimized and can upload multiple parts concurrently. Non-exact upload sizes is supported for a follow-up change which will allow compression to and from backend stores.

allada force-pushed the s3-store-supports-estimates-and-buffers branch from f6da5ed to 6a9b50e Compare November 5, 2021 04:44

allada commented Nov 5, 2021

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allada merged commit d093fdd into master Nov 5, 2021

allada deleted the s3-store-supports-estimates-and-buffers branch November 11, 2021 06:21

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Stores now support non-exact upload sizes & S3 store optimizations#11
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