perf(partition): avoid blocking async lookup - #303
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Deduplicate cold creation with per-key task completion so async callers yield. Add lifecycle callbacks, metrics, snapshots, and bounded stress coverage.
Release the mutation gate before invoking lifecycle observers while preserving callback-before-replacement ordering.
Complete saturated cold lookups reentered from eviction callbacks without retaining them, preserving callback-before-slot-reuse ordering. Document the partition eviction metric and make its consistency test deterministic.\n\nRefs #230
Eviction callbacks create an unretained shield instead of joining a publication that cannot finish until the callback returns.
Track the creation blocked by eviction callbacks so nested same-key lookups cannot join their awaiting publisher after capacity changes.
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Chain nested callback dependencies and install reservation scope before metrics so reentrant lookups cannot wait on their caller.
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Closes #230
Summary
Validation
dotnet build Kevlar.slnx -c Release -m:1 -nr:false— 0 warnings/errorsKevlar.Tests— 994 passed on net8.0; 1,019 passed on net10.0Kevlar.Chaos.Tests— 35 passed on each TFMKevlar.AllocationTests— 4 passed on each TFMnpm run build— Docusaurus production build passedBenchmarks
BenchmarkDotNet 0.15.8, .NET 10.0.11, Windows 11, i7-12700K.
249b440)5bbba87)Capacity_EvictionWarm_Lookup