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diff --git a/seaweedfs-rdma-sidecar/FUTURE-WORK-TODO.md b/seaweedfs-rdma-sidecar/FUTURE-WORK-TODO.md new file mode 100644 index 000000000..cc7457b90 --- /dev/null +++ b/seaweedfs-rdma-sidecar/FUTURE-WORK-TODO.md @@ -0,0 +1,276 @@ +# SeaweedFS RDMA Sidecar - Future Work TODO + +## π― **Current Status (β
COMPLETED)** + +### **Phase 1: Architecture & Integration - DONE** +- β
**Complete Go β Rust IPC Pipeline**: Unix sockets + MessagePack +- β
**SeaweedFS Integration**: Mount client with RDMA acceleration +- β
**Docker Orchestration**: Multi-service setup with proper networking +- β
**Error Handling**: Robust fallback and recovery mechanisms +- β
**Performance Optimizations**: Zero-copy page cache + connection pooling +- β
**Code Quality**: All GitHub PR review comments addressed +- β
**Testing Framework**: Integration tests and benchmarking tools + +### **Phase 2: Mock Implementation - DONE** +- β
**Mock RDMA Engine**: Complete Rust implementation for development +- β
**Pattern Data Generation**: Predictable test data for validation +- β
**Simulated Performance**: Realistic latency and throughput modeling +- β
**Development Environment**: Full testing without hardware requirements + +--- + +## π **PHASE 3: REAL RDMA IMPLEMENTATION** + +### **3.1 Hardware Abstraction Layer** π΄ **HIGH PRIORITY** + +#### **Replace Mock RDMA Context** +**File**: `rdma-engine/src/rdma.rs` +**Current**: +```rust +RdmaContextImpl::Mock(MockRdmaContext::new(config).await?) +``` +**TODO**: +```rust +// Enable UCX feature and implement +RdmaContextImpl::Ucx(UcxRdmaContext::new(config).await?) +``` + +**Tasks**: +- [ ] Implement `UcxRdmaContext` struct +- [ ] Add UCX FFI bindings for Rust +- [ ] Handle UCX initialization and cleanup +- [ ] Add feature flag: `real-ucx` vs `mock` + +#### **Real Memory Management** +**File**: `rdma-engine/src/rdma.rs` lines 245-270 +**Current**: Fake memory regions in vector +**TODO**: +- [ ] Integrate with UCX memory registration APIs +- [ ] Implement HugePage support for large transfers +- [ ] Add memory region caching for performance +- [ ] Handle registration/deregistration errors + +#### **Actual RDMA Operations** +**File**: `rdma-engine/src/rdma.rs` lines 273-335 +**Current**: Pattern data + artificial latency +**TODO**: +- [ ] Replace `post_read()` with real UCX RDMA operations +- [ ] Implement `post_write()` with actual memory transfers +- [ ] Add completion polling from hardware queues +- [ ] Handle partial transfers and retries + +### **3.2 Data Path Replacement** π‘ **MEDIUM PRIORITY** + +#### **Real Data Transfer** +**File**: `pkg/rdma/client.go` lines 420-442 +**Current**: +```go +// MOCK: Pattern generation +mockData[i] = byte(i % 256) +``` +**TODO**: +```go +// Get actual data from RDMA buffer +realData := getRdmaBufferContents(startResp.LocalAddr, startResp.TransferSize) +validateDataIntegrity(realData, completeResp.ServerCrc) +``` + +**Tasks**: +- [ ] Remove mock data generation +- [ ] Access actual RDMA transferred data +- [ ] Implement CRC validation: `completeResp.ServerCrc` +- [ ] Add data integrity error handling + +#### **Hardware Device Detection** +**File**: `rdma-engine/src/rdma.rs` lines 222-233 +**Current**: Hardcoded Mellanox device info +**TODO**: +- [ ] Enumerate real RDMA devices using UCX +- [ ] Query actual device capabilities +- [ ] Handle multiple device scenarios +- [ ] Add device selection logic + +### **3.3 Performance Optimization** π’ **LOW PRIORITY** + +#### **Memory Registration Caching** +**TODO**: +- [ ] Implement MR (Memory Region) cache +- [ ] Add LRU eviction for memory pressure +- [ ] Optimize for frequently accessed regions +- [ ] Monitor cache hit rates + +#### **Advanced RDMA Features** +**TODO**: +- [ ] Implement RDMA Write operations +- [ ] Add Immediate Data support +- [ ] Implement RDMA Write with Immediate +- [ ] Add Atomic operations (if needed) + +#### **Multi-Transport Support** +**TODO**: +- [ ] Leverage UCX's automatic transport selection +- [ ] Add InfiniBand support +- [ ] Add RoCE (RDMA over Converged Ethernet) support +- [ ] Implement TCP fallback via UCX + +--- + +## π§ **PHASE 4: PRODUCTION HARDENING** + +### **4.1 Error Handling & Recovery** +- [ ] Add RDMA-specific error codes +- [ ] Implement connection recovery +- [ ] Add retry logic for transient failures +- [ ] Handle device hot-plug scenarios + +### **4.2 Monitoring & Observability** +- [ ] Add RDMA-specific metrics (bandwidth, latency, errors) +- [ ] Implement tracing for RDMA operations +- [ ] Add health checks for RDMA devices +- [ ] Create performance dashboards + +### **4.3 Configuration & Tuning** +- [ ] Add RDMA-specific configuration options +- [ ] Implement auto-tuning based on workload +- [ ] Add support for multiple RDMA ports +- [ ] Create deployment guides for different hardware + +--- + +## π **IMMEDIATE NEXT STEPS** + +### **Step 1: UCX Integration Setup** +1. **Add UCX dependencies to Rust**: + ```toml + [dependencies] + ucx-sys = "0.1" # UCX FFI bindings + ``` + +2. **Create UCX wrapper module**: + ```bash + touch rdma-engine/src/ucx.rs + ``` + +3. **Implement basic UCX context**: + ```rust + pub struct UcxRdmaContext { + context: *mut ucx_sys::ucp_context_h, + worker: *mut ucx_sys::ucp_worker_h, + } + ``` + +### **Step 2: Development Environment** +1. **Install UCX library**: + ```bash + # Ubuntu/Debian + sudo apt-get install libucx-dev + + # CentOS/RHEL + sudo yum install ucx-devel + ``` + +2. **Update Cargo.toml features**: + ```toml + [features] + default = ["mock"] + mock = [] + real-ucx = ["ucx-sys"] + ``` + +### **Step 3: Testing Strategy** +1. **Add hardware detection tests** +2. **Create UCX initialization tests** +3. **Implement gradual feature migration** +4. **Maintain mock fallback for CI/CD** + +--- + +## ποΈ **ARCHITECTURE NOTES** + +### **Current Working Components** +- β
**Go Sidecar**: Production-ready HTTP API +- β
**IPC Layer**: Robust Unix socket + MessagePack +- β
**SeaweedFS Integration**: Complete mount client integration +- β
**Docker Setup**: Multi-service orchestration +- β
**Error Handling**: Comprehensive fallback mechanisms + +### **Mock vs Real Boundary** +``` +βββββββββββββββββββ βββββββββββββββββββ βββββββββββββββββββ +β SeaweedFS ββββββΆβ Go Sidecar ββββββΆβ Rust Engine β +β (REAL) β β (REAL) β β (MOCK) β +βββββββββββββββββββ βββββββββββββββββββ βββββββββββββββββββ + β + βΌ + βββββββββββββββββββ + β RDMA Hardware β + β (TO IMPLEMENT) β + βββββββββββββββββββ +``` + +### **Performance Expectations** +- **Current Mock**: ~403 ops/sec, 2.48ms latency +- **Target Real**: ~4000 ops/sec, 250ΞΌs latency (UCX optimized) +- **Bandwidth Goal**: 25-100 Gbps (depending on hardware) + +--- + +## π **REFERENCE MATERIALS** + +### **UCX Documentation** +- **GitHub**: https://github.com/openucx/ucx +- **API Reference**: https://openucx.readthedocs.io/ +- **Rust Bindings**: https://crates.io/crates/ucx-sys + +### **RDMA Programming** +- **InfiniBand Architecture**: Volume 1 Specification +- **RoCE Standards**: IBTA Annex A17 +- **Performance Tuning**: UCX Performance Guide + +### **SeaweedFS Integration** +- **File ID Format**: `weed/storage/needle/file_id.go` +- **Volume Server**: `weed/server/volume_server_handlers_read.go` +- **Mount Client**: `weed/mount/filehandle_read.go` + +--- + +## β οΈ **IMPORTANT NOTES** + +### **Breaking Changes to Avoid** +- **Keep IPC Protocol Stable**: Don't change MessagePack format +- **Maintain HTTP API**: Existing endpoints must remain compatible +- **Preserve Configuration**: Environment variables should work unchanged + +### **Testing Requirements** +- **Hardware Tests**: Require actual RDMA NICs +- **CI/CD Compatibility**: Must fallback to mock for automated testing +- **Performance Benchmarks**: Compare mock vs real performance + +### **Security Considerations** +- **Memory Protection**: Ensure RDMA regions are properly isolated +- **Access Control**: Validate remote memory access permissions +- **Data Validation**: Always verify CRC checksums + +--- + +## π― **SUCCESS CRITERIA** + +### **Phase 3 Complete When**: +- [ ] Real RDMA data transfers working +- [ ] Hardware device detection functional +- [ ] Performance exceeds mock implementation +- [ ] All integration tests passing with real hardware + +### **Phase 4 Complete When**: +- [ ] Production deployment successful +- [ ] Monitoring and alerting operational +- [ ] Performance targets achieved +- [ ] Error handling validated under load + +--- + +**π
Last Updated**: December 2024 +**π€ Contact**: Resume from `seaweedfs-rdma-sidecar/` directory +**π·οΈ Version**: v1.0 (Mock Implementation Complete) + +**π Ready to resume**: All infrastructure is in place, just need to replace the mock RDMA layer with UCX integration! |