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RonDB

rondb.com

Free plan LinuxAPISelf-hosted
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Spec score 7.5 #17 of 31 in Key-Value Databases

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 storage and MySQL-server compute. Applications can use the MySQL Server API for SQL-compatible access and parallel queries. ACID transactions are provided through MySQL-server support; in-memory data is persisted using REDO logs and checkpoints.

RonDB describes its performance aims as low latency, high availability, high throughput, and scalable storage. It 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 deployments using 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 is used as the online feature-store database for machine-learning applications in Hopsworks. The serverless plan through Hopsworks is free, with quotas on Feature Groups and memory usage.

Spec sheet

What it does
RonDB is a distributed, shared-nothing storage engine and an open-source fork of MySQL NDB Cluster for real-time applications.Read 1 Oct 2026 · docs.rondb.com
AI integrations
RonDB supports AI application storage integrated with Spark and Kafka.Read 1 Oct 2026 · rondb.com
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.Read 1 Oct 2026 · docs.rondb.com
Encryption at rest
RonDB supports encryption of on-disk data including local checkpoints, tablespaces, REDO logs and UNDO logs, but not backups.Read 1 Oct 2026 · docs.rondb.com
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.Read 1 Oct 2026 · docs.rondb.com
Performance model
RonDB targets low latency, high availability, high throughput and scalable storage, which it calls LATS.Read 1 Oct 2026 · docs.rondb.com
Primary use case
RonDB is used as the online feature-store database for low-latency, high-availability machine-learning applications in Hopsworks.Read 1 Oct 2026 · docs.rondb.com
Redis compatibility
Rondis implements a Redis server using RonDB storage and the Redis wire protocol.Read 1 Oct 2026 · docs.rondb.com
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.Read 1 Oct 2026 · docs.rondb.com
REST security
The RonDB REST API supports Hopsworks API-key authentication and recommends TLS when API keys are used.Read 1 Oct 2026 · docs.rondb.com
Scaling
RonDB supports online horizontal and vertical scaling for storage and MySQL-server compute.Read 1 Oct 2026 · docs.rondb.com
SQL access
Applications can access RonDB through the MySQL Server API with SQL compatibility and parallel query support.Read 1 Oct 2026 · rondb.com
Storage scale
RonDB supports up to 1 PiB of storage.Read 1 Oct 2026 · docs.rondb.com
Transactional limit
RonDB uses read-committed isolation and does not support range locks.Read 1 Oct 2026 · docs.rondb.com
Transactions
RonDB is ACID compliant through MySQL-server support, with in-memory data persisted using REDO logs and checkpoints.Read 1 Oct 2026 · docs.rondb.com

Plans and prices

Serverless RonDB via Hopsworks Free quotas on Feature Groups (tables) · quotas on memory usage Read 1 Oct 2026 · docs.rondb.com

Every RonDB plan and price →

Strong points and limits

Strong points

  • Open source and free.
  • Supports up to 1 PiB of storage.
  • Online horizontal and vertical scaling.
  • SQL-compatible access through the MySQL Server API.
  • Supports synchronous and asynchronous replication.

Limits

  • Free Hopsworks plan has Feature Group and memory quotas.
  • On-premises deployment is by inquiry.
  • Read-committed isolation does not support range locks.
  • Encryption at rest does not cover backups.

Who it suits

RonDB suits teams building real-time applications that need distributed storage, SQL access, or a feature-store database. It offers self-hosted and cloud deployment paths, including use of your own cloud credentials.

Verdict

RonDB offers distributed storage with SQL access, scaling, and multiple deployment options. Review its transaction isolation and backup-encryption limits against your requirements.

Where Specifiction places it

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