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RonDB
What it is
RonDB is an open-source distributed storage engine for real-time applications and a fork of MySQL NDB Cluster. Its shared-nothing design supports up to 1 PiB of storage, with online horizontal and vertical scaling for both storage and MySQL-server compute. Applications can connect through the MySQL Server API for SQL-compatible access and parallel queries. Through MySQL-server support, RonDB provides ACID transactions; in-memory data is persisted using REDO logs and checkpoints. The project describes its goals as low latency, high availability, high throughput, and scalable storage. It also supports AI application storage integrated with Spark and Kafka, while Rondis implements a Redis server using RonDB storage and the Redis wire protocol. Deployment options include local testing, Docker, cloud use with your own AWS, Azure, or GCP credentials, and on-premises deployment by inquiry. Replication can be synchronous active-active across availability zones or asynchronous across regions with conflict resolution. RonDB uses read-committed isolation and does not support range locks. A free Hopsworks serverless plan has quotas on Feature Groups and memory usage.
For and against
For
- Open-source and free to use.
- Supports up to 1 PiB of storage.
- Offers online horizontal and vertical scaling.
- Provides SQL access through the MySQL Server API.
- Supports cross-zone and cross-region replication.
Against
- Uses read-committed isolation.
- Does not support range locks.
- On-premises deployment is available by inquiry.
The verdict
RonDB pairs distributed storage and scaling with SQL access, replication, and AI-related integrations. Its read-committed isolation and lack of range locks are important constraints to consider for transactional workloads.
Who it suits
RonDB suits developers building real-time applications, including machine-learning feature-store workloads. It also fits teams seeking an open-source database that can be run locally, in Docker, in a cloud account, or on premises.
Plans and prices
Serverless RonDB via Hopsworks
quotas on Feature Groups (tables) · quotas on memory usage
Read 1 Oct 2026 · docs.rondb.com
On the record
- AI integrations
- RonDB supports AI application storage integrated with Spark and Kafka.rondb.com · read 1 Oct 2026
- Deployment options
- RonDB can be tested locally, run in Docker, managed in AWS, Azure or GCP using own cloud credentials, or deployed on-premises by inquiry.docs.rondb.com · read 1 Oct 2026
- Encryption at rest
- RonDB supports encryption of on-disk data including local checkpoints, tablespaces, REDO logs and UNDO logs, but not backups.docs.rondb.com · read 1 Oct 2026
- Maker support
- RonDB is brought to you by the RonDB team at Hopsworks AB, which provides dedicated support for high-performance online feature-store requirements.docs.rondb.com · read 1 Oct 2026
- Performance model
- RonDB targets low latency, high availability, high throughput and scalable storage, which it calls LATS.docs.rondb.com · read 1 Oct 2026
- Primary use case
- RonDB is used as the online feature-store database for low-latency, high-availability machine-learning applications in Hopsworks.docs.rondb.com · read 1 Oct 2026
- Redis compatibility
- Rondis implements a Redis server using RonDB storage and the Redis wire protocol.docs.rondb.com · read 1 Oct 2026
- Replication
- RonDB supports synchronous cross-availability-zone active-active replication with 1 to 3 replicas and asynchronous cross-region replication across clusters with conflict resolution.docs.rondb.com · read 1 Oct 2026
- REST security
- The RonDB REST API supports Hopsworks API-key authentication and recommends TLS when API keys are used.docs.rondb.com · read 1 Oct 2026
- Scaling
- RonDB supports online horizontal and vertical scaling for storage and MySQL-server compute.docs.rondb.com · read 1 Oct 2026
- SQL access
- Applications can access RonDB through the MySQL Server API with SQL compatibility and parallel query support.rondb.com · read 1 Oct 2026
- Storage scale
- RonDB supports up to 1 PiB of storage.docs.rondb.com · read 1 Oct 2026
- Transactional limit
- RonDB uses read-committed isolation and does not support range locks.docs.rondb.com · read 1 Oct 2026
- Transactions
- RonDB is ACID compliant through MySQL-server support, with in-memory data persisted using REDO logs and checkpoints.docs.rondb.com · read 1 Oct 2026
- What it does
- RonDB is a distributed, shared-nothing storage engine and an open-source fork of MySQL NDB Cluster for real-time applications.docs.rondb.com · read 1 Oct 2026
