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Add fluss-microbench module with YAML-driven perf framework and JMH benchmarks - #3082
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Run three KV benchmark scenarios against an independently started Fluss cluster. Keep the JMH module unchanged and configure client memory, bucket count, and concurrency in the standalone module.
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Unified benchmarking module combining YAML-driven performance testing (write/lookup/scan/mixed workloads with resource sampling and reporting) and JMH micro-benchmarks (Arrow channel, log scanner).
Key features:
CLI design: workload parameters (records, threads, warmup, duration) are YAML-only and cannot be overridden via CLI, ensuring every benchmark report is statistically reliable. Warmup semantics are per-phase global (divided by threads internally). Validator enforces warmup < records/2, effective records per thread >= 10,000, and unique phase names per scenario.
Phase names support type-prefix convention (e.g. write-bulk, write-sustained) resolved via longest-prefix matching to PhaseType. Preset tuning: thread counts capped at 8/4, warmup 500K global for JIT C2 coverage, duration-based write phases (5m) for stable measurement windows, scan warmup for cold-start elimination.
Purpose
Linked issue: close #3080
Brief change log
Tests
API and Format
Documentation