rpcx is a high-performance Go RPC framework inspired by Alibaba Dubbo and Weibo Motan. It provides a complete set of features for building microservices: multiple transport protocols (TCP, HTTP, QUIC, KCP, RDMA, io_uring), multiple serialization formats (JSON, Protobuf, MessagePack, Thrift, raw bytes), service discovery (peer-to-peer, DNS, mDNS, Redis, etcd, consul, zookeeper), load balancing (random, round-robin, weighted, consistent hashing, geographic, ICMP-based), fault tolerance (failover, failfast, failtry, failbackup), compression (gzip, snappy), and a plugin system for extensibility. The architecture separates client and server concerns with clear interfaces: RPCClient for low-level communication, XClient for high-level service governance with discovery and load balancing, and Server for hosting services with reflection-based registration. The codebase demonstrates strong engineering practices with extensive use of interfaces, dependency injection, and object pooling for performance. It includes a comprehensive test suite and benchmarks. Key components include a binary protocol with buffer pooling for zero-copy encoding, a plugin container with multiple extension points (pre/post call, connection handling, etc.), a circuit breaker implementation with sliding window, and various selectors for load balancing. The project has been actively maintained with recent refactoring to split large files into focused modules and add method-level service registration. The code is well-structured with clear separation of concerns, though some parts (like the unsafe pointer conversions in util/converter.go) show pragmatic trade-offs for performance.