Pravega
Pravega is an open-source storage system for continuous data, organized into durable, append-only streams.
What Pravega is
Pravega is an open-source storage system for continuous data, organized into durable, append-only streams. Streams can scale as ingestion rates change, with automatic tiering to scale-out storage, and can retain data indefinitely for access to current and historical events. Pravega describes exactly-once delivery and processing with ordering guarantees despite client, server, or network failures. Transactions allow a developer to write a group of events atomically. The system is aimed at streaming applications, IoT data, and batch or interactive analytics on large data volumes. Listed connectors include Apache Flink, Spark, Hadoop, Presto, Boomi, and Apache NiFi; supported client languages include Java, Rust, and Python. It can run as a standalone server or in distributed mode, including with Docker Compose. Standalone clients connect through localhost only. For distributed production deployments, the listed prerequisites include Java 11, a long-term storage option, ZooKeeper 3.6.3, and BookKeeper 4.14.1. TLS encryption and role-based access control are configurable, but standalone security settings are off by default. Pravega is free and self-hosted.
Good
- Streams can retain data indefinitely.
- Supports atomic writes through transactions.
- Lists exactly-once delivery and processing.
- Connectors include Flink, Spark, and Apache NiFi.
- Free and open source.
Watch out
- Standalone clients can connect through localhost only.
- Standalone security settings are off by default.
- Distributed production deployment lists several prerequisites.
- No free trial is listed.
Who it suits
Pravega suits developers building streaming or real-time applications, IoT data pipelines, or analytics systems that need current and historical events. It is intended for teams able to deploy and operate self-hosted storage.
Verdict
Pravega is a free, self-hosted option for storing continuous data in streams, with scaling and retention capabilities. Plan for deployment prerequisites in distributed production use, and configure security where required.
The facts
Each one read from Pravega's own pages, with the date it was checked.
What it does
- Auto-scaling
- Pravega can automatically adjust individual streams’ parallelism to accommodate changes in data ingestion rate.checked 5 Oct 2026
- Autoscaling
- Pravega can automatically scale individual data streams as data ingestion rates change.checked 5 Oct 2026
- Deployment
- Pravega offers standalone mode for development and testing and distributed mode for production, including Kubernetes operators and Docker Swarm deployment options.checked 5 Oct 2026
- Exactly-once
- Pravega describes exactly-once delivery and processing with ordering guarantees despite client, server, or network failures.checked 5 Oct 2026
- Exactly-once processing
- Pravega describes exactly-once event delivery and processing with ordering guarantees despite client, server, or network failures.checked 5 Oct 2026
- Integrations
- The documented connectors include Apache Flink, Apache Spark, Apache Hadoop, Presto, Boomi, and Apache NiFi.checked 5 Oct 2026
- License
- Pravega describes itself as 100% open source and community-driven, with components available under the Apache 2 License on GitHub.checked 5 Oct 2026
- Product
- Pravega is a storage system built around durable, elastic, append-only streams for continuous, unbounded data.checked 5 Oct 2026
- Production prerequisites
- The deployment guide lists Java 11, and for distributed production deployments it lists AWS S3, Azure Blob Storage, Google Cloud Storage, HDFS or a mounted distributed filesystem, ZooKeeper 3.6.3, and BookKeeper 4.14.1.checked 5 Oct 2026
- Retention
- Pravega supports retaining stream data according to application needs, with capacity limited by the configured storage cluster or cloud provider.checked 5 Oct 2026
- Security
- Pravega supports configurable TLS encryption and role-based access control; its standalone security settings are off by default.checked 5 Oct 2026
- Standalone limitation
- In standalone mode, clients access the server through the localhost interface only.checked 5 Oct 2026
- Stream storage
- A Pravega stream stores unbounded parallel sequences of bytes durably, elastically, and consistently, with automatic tiering to scale-out storage.checked 5 Oct 2026
- Support
- The site directs users to the Pravega community on Slack for help and to GitHub Issues to report bugs.checked 5 Oct 2026
- Transactions
- Pravega transactions let a developer write a set of events to a stream atomically.checked 5 Oct 2026
- Use case
- Pravega is designed for streaming applications that ingest continuous data and need low-latency access to both current and historical data.checked 5 Oct 2026
- What it does
- Pravega is an open-source storage system that uses streams to store continuous, unbounded data.checked 5 Oct 2026
- Who it is for
- The FAQ describes Pravega as suited to streaming and real-time application data, IoT data, and batch or interactive analytics on large amounts of data.checked 5 Oct 2026
The company
- Headquarters
- Seattle, WA, USAchecked 28 Sep 2026
Alternatives to Pravega
- 1
Aiven for Apache Kafka
Free planOpen sourceWebAPILinuxSelf-hosted7.9From $35 a month - 2
Apache RocketMQ
Free planOpen sourceAPILinuxmacOSSelf-hosted7.5Free plan - 3
Redpanda
Free planWebAPILinuxmacOS7.4Free plan - 4
Confluent Cloud
Free planWebAPILinux7.1From $385 a month - 5
Lightstreamer
Free planAndroidiOSWebAPI7.1Free plan - 6
Solace PubSub+ Event Broker
Free planWebAPILinuxSelf-hosted7.1Free plan