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f925ad1739
Fix A: op-kind-aware ensure_expected_version. Insert/Merge skip the strict pre-stage check; Update/Delete/SchemaRewrite keep it. New MutationOpKind enum threaded through open_for_mutation_on_branch / open_owned_dataset_for_branch_write / reopen_for_mutation and all callers (execute_insert/update/delete_node/delete_edge, branch_merge::publish_rewritten_merge_table, schema_apply, ensure_indices_for_branch, loader Append/Merge/Overwrite). Closes the 77% rejection rate on same-key concurrent inserts. Fix B: coordinator Mutex -> RwLock. Reads parallelize via .read(); writes serialize via .write(). Atomic-commit invariant preserved by the single .write() covering commit_manifest_updates + record_graph_commit. Bench-as-test change_concurrent_inserts_same_key_serialize_without_409 (server.rs:2180) spawns 12 concurrent /change inserts on a single (table, branch); asserts every request returns 200. Was failing pre-Phase-2; passes post-Phase-2. change_conflict_returns_manifest_conflict_409 (cross-process drift sentinel) and branch_merge_conflict_response_includes_structured_conflicts both still pass. Bench (after-pr2-phase2): - single-actor 1x1: 14.9 ops/s, p50 68ms (baseline 12.3, +22%) - disjoint 8x8: 7.04 ops/s, p50 1023ms (baseline 6.24, +13%) - same-key 8x1: 2.62 ops/s, 0 errors (after-pr2: 77% errors) Disjoint stayed at +13% — Fix B's RwLock helped read paths but the publisher's .write() critical section still serializes graph-wide. Splitting GraphCoordinator into per-concern primitives (manifest in ArcSwap, commit_graph in RwLock, atomic-commit serializer) is the deferred next step. 102 lib + 30 branching + 24 runs + 16 staged_writes + 63 end_to_end + 40 server tests pass. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com> |
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