Hadron vs RisingWave

Hadron is an open-source, self-hosted distributed data-storage and messaging system for ingesting events and coordinating multi-stage workflows. Streams are append-only logs with absolute ordering within each partition and horizontal scaling. Pipelines orchestrate stages over Stream data and can begin when an event matches a configured trigger. Exchanges handle ephemeral messages, while Endpoints provide general-purpose RPC handlers. Streams, pipeline inputs and outputs, and ephemeral messages use the CloudEvents 1.0 model. Hadron is designed for Kubernetes and installed with Helm and Kubernetes configuration resources; the quick start requires Helm 3.7.0 or later for OCI usage. Stream availability continues while at least one partition runs. Retention can use a configurable time policy, defaulting to seven days, or retain data indefinitely. Producers and Consumers may be written in any language, with an official Rust client and CLI. Components expose Prometheus metrics over HTTP, including Prometheus scraping and OTEL collector integrations. Token-based access creates JWTs signed by the Operator’s private RSA key, with resource-level permissions. External CLI access is still in progress, and Hadron Cloud is under construction.

RisingWave is a distributed SQL platform for ingesting, transforming, and serving real-time data. Its SQL interface is wire-compatible with PostgreSQL, so PostgreSQL clients, drivers, and tools can connect. New events incrementally refresh materialized views. Barrier-based checkpointing and consistent snapshots support exactly-once processing, while data is persisted in S3-compatible object storage and connector offsets are checkpointed for delivery durability. RisingWave lists 31+ native connectors, including Kafka, PostgreSQL, MySQL, Iceberg, Snowflake, BigQuery, S3, Redis, and Elasticsearch. Self-managed deployments are Apache 2.0 open source, with Docker, Kubernetes, cloud VM, and on-premises options. The hosted Basic plan is $0.23 a month, pay-as-you-go, limited to 64 cores and available in select regions; a free plan and 7-day trial are also listed. Basic includes standard support. Premium 24x7 support can be purchased with Pro, while self-managed deployments offer premium support with an SLA and quarterly success reviews. Listed platforms include API, Linux, macOS, self-hosted, and web.