ScyllaDB Rust Driver

This is a client-side driver for ScyllaDB written in pure Rust with a fully async API using Tokio. Although optimized for ScyllaDB, the driver is also compatible with Apache Cassandra®.

Note: this driver is officially supported but currently available in beta. Bug reports and pull requests are welcome!

Getting Started

The documentation book is a good place to get started. Another useful resource is the Rust and Scylla lesson on Scylla University.

Examples

use futures::TryStreamExt;

let uri = "127.0.0.1:9042";

let session: Session = SessionBuilder::new().known_node(uri).build().await?;

let query_pager = session.query_iter("SELECT a, b, c FROM ks.t", &[]).await?;
let mut stream = query_pager.rows_stream::<(i32, i32, String)>()?;
while let Some((a, b, c)) = stream.try_next().await? {
    println!("a, b, c: {}, {}, {}", a, b, c);
}

Please see the full example program for more information. You can also run the example as follows if you have a Scylla server running:

SCYLLA_URI="127.0.0.1:9042" cargo run --example basic

All examples are available in the examples directory

Features and Roadmap

The driver supports the following:

• Asynchronous API
• Token-aware routing
• Shard-aware routing (specific to ScyllaDB)
• Prepared statements
• Query paging
• Compression (LZ4 and Snappy algorithms)
• CQL binary protocol version 4
• Batch statements
• Configurable load balancing policies
• Driver-side metrics
• TLS support - install openssl if you want to use it https://docs.rs/openssl/0.10.32/openssl/#automatic
• Configurable retry policies
• Authentication support
• CQL tracing

Ongoing efforts:

• CQL Events
• More tests
• More benchmarks

Getting Help

Please join the #rust-driver channel on ScyllaDB Slack to discuss any issues or questions you might have.

Supported Rust Versions

Our driver's minimum supported Rust version (MSRV) is 1.70.0. Any changes:

• Will be announced in release notes.
• Before 1.0 will only happen in major releases.
• After 1.0 will also happen in minor, but not patch releases.

Exact MSRV policy after 1.0 is not yet decided.

Reference Documentation

• CQL binary protocol specification version 4

Other Drivers

• cdrs-tokio: Apache Cassandra driver written in pure Rust.
• cassandra-rs: Rust wrappers for the DataStax C++ driver for Apache Cassandra.

License

This project is licensed under either of

• Apache License, Version 2.0, (LICENSE-APACHE or http://www.apache.org/licenses/LICENSE-2.0)
• MIT license (LICENSE-MIT or http://opensource.org/licenses/MIT)

at your option.