This is a production-grade Kubernetes operator written in Go that manages the full lifecycle of MariaDB databases (including Galera clusters, asynchronous replication, and MaxScale proxies) on Kubernetes. It implements a custom resource definition (CRD) pattern with controllers, validating webhooks, and sidecar agents to handle deployment, scaling, TLS, backups (logical and physical), point-in-time recovery, and SQL resource management (users, grants, databases). The operator is built with controller-runtime and kubebuilder, and includes extensive integration tests using Ginkgo/Gomega and envtest. Its architecture is modular, with separate controllers for each CRD, reusable builder packages for Kubernetes objects, and well-factored utility packages for data structures, PKI, condition management, and statefulset helpers. The codebase is actively maintained, with a rich set of examples, Helm charts, and multi-cluster support. It does not include any data research or analytics components.
Galera is a synchronous multi-master replication middleware for transactional databases, primarily MySQL and MariaDB, implemented as a wsrep provider shared library (libgalera_smm.so). The codebase provides total-order multicast group communication via a layered protocol stack (GCS/gcomm), conflict detection through certification of write-sets, incremental state transfer (IST) with a multi-tier cache (gcache), and an arbitrator daemon (garbd) for quorum maintenance. Architecturally, it is structured as a set of cooperating C++ libraries: galerautils (memory allocators, configuration, threading, hashing), gcs (group communication service with membership and flow control), gcomm (transport abstraction with EVS/PC/GMCast protocols), galera (replication engine with certification and write-set handling), and gcache (write-set caching in memory, ring buffer, and memory-mapped pages). The code is well-tested with unit tests (Check framework), regression tests, and integration test scripts. While the core replication logic and utility libraries are well-crafted and modular, the project bundles an older version of the ASIO networking library and retains C++03 compatibility shims, contributing to moderate technical drift. The repository is actively maintained with regular commits and issue triage.