KHARSHAVARDHAN-eng opened a new pull request, #359:
URL: https://github.com/apache/hugegraph-computer/pull/359
### Description
This PR implements the initial Rust modernization baseline and
proof-of-concept framework for **HugeGraph Computer** and **Vermeer** as
outlined in parent roadmap issue #355.
### Key Changes
1. **Core Rust Kernel (`computer-rust`)**:
- `CSRGraph`: High-performance Compressed Sparse Row / Column
memory-efficient graph representation.
- `PageRankKernel` & `SsspKernel`: Vectorized, parallelized PageRank and
Single Source Shortest Path computing kernels.
- `AtomicAggregator`: Lock-free thread-safe aggregators for superstep
reductions.
- `C-ABI FFI Layer`: Exported functions in `computer_rust_c_api.h` and
`src/ffi/c_api.rs` for JNI (Java) and CGO/gRPC (Go) interoperability.
2. **Correctness Fixtures & Baseline Tolerances**:
- Datasets: Standard Karate Club dataset fixture and synthetic power-law
graph generator.
- Differential Tolerance: $L_1$-distance and epsilon floating-point
parity assertion suite against ground-truth baselines.
- Benchmarks: Criterion harness (`benches/kernel_bench.rs`) for measuring
iteration speed and memory scaling.
3. **Integration Adapters**:
- Java (`computer-core`): `RustKernelBridge.java` with graceful fallback
to pure Java `Computation` execution if native library is absent.
- Go (`vermeer`): `rust_bridge.go` in `apps/compute` with fallback
execution.
4. **CI & Documentation**:
- `.github/workflows/rust-ci.yml`: Automated `cargo fmt`, `clippy`,
`cargo test`, and release build validation.
- `docs/rust-modernization-roadmap.md`: Comprehensive architecture
overview, baseline principles, safety guardrails, and newcomer-friendly child
issue breakdowns.
### Reference
Fixes #355
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