Leonardo Cecchi & Jeremy Schneider: Quorum-Based Consistency for Cluster Changes with CloudNativePG скачать в хорошем качестве

Leonardo Cecchi & Jeremy Schneider: Quorum-Based Consistency for Cluster Changes with CloudNativePG

Most people don’t think of Postgres in the context of quorum or distributed systems theory but vanilla open source Postgres has supported quorum commits across multiple replicas for almost 10 years now. Technologies like Cassandra and Dynamo popularized quorum consistency in the hot path of distributed writes and reads, but the theory also applies to cluster re-configurations in a single-writer database like Postgres. Stateful operators at level V of the capabilities framework require very careful end-to-end coordination between control plane and data plane algorithms to avoid data loss when providing auto-healing under circumstances like network partitions or compounded failures. This session will explore how quorum consistency can be applied in the CloudNativePG operator, offering lessons and insights to fellow maintainers of other Kubernetes operators for stateful workloads. This session is the full version of their KubeCon + CloudNativeCon NA 2025 talk.