CDRS is production-ready Apache Cassandra driver written in pure Ru* *s**t. Focuses on providing high level of configurability to suit most use cases at any scale, as its Java counterpart, while also leveraging the safety and performance of Rust.

• Asynchronous API;
• TCP/TLS connection (rustls);
• Topology-aware dynamic and configurable load balancing;
• Configurable connection strategies and pools;
• Configurable speculative execution;
• LZ4, Snappy compression;
• Cassandra-to-Rust data serialization/deserialization with custom type support;
• Pluggable authentication strategies;
• ScyllaDB support;
• Server events listening;
• Multiple CQL version support (3, 4, 5), full spec implementation;
• Query tracing information;
• Prepared statements;
• Query paging;
• Batch statements;
• Configurable retry and reconnection policy;
• Support for interleaved queries;
• Support for Yugabyte YCQL JSONB;
• Support for beta protocol usage;

Due to high configurability of CDRS, the performance will vary depending on use case. The following benchmarks have been made against the latest (master as of 03-12-2021) versions of respective libraries (except cassandra-cpp: 2.16.0) and protocol version 4.

• cdrs-tokio-large-pool - CDRS with node connection pool equal to double of physical CPU cores
• cdrs-tokio-small-pool - CDRS with a single connection per node
• scylladb-rust-large-pool - scylla crate with node connection pool equal to double of physical CPU cores
• scylladb-rust-small-pool - scylla crate with a single connection per node
• cassandra-cpp - Rust bindings for Datastax C++ Driver, running on multiple threads using Tokio
• gocql - a driver written in Go

Knowing given use case, CDRS can be optimized for peak performance.

• User guide.
• Examples.
• API docs.
• Using ScyllaDB with RUST lesson.

This example configures a cluster consisting of a single node without authentication, and uses round-robin load balancing. Other options are kept as default.

use cdrs_tokio::cluster::session::{TcpSessionBuilder, SessionBuilder};
use cdrs_tokio::cluster::NodeTcpConfigBuilder;
use cdrs_tokio::load_balancing::RoundRobinLoadBalancingStrategy;
use cdrs_tokio::query::*;

#[tokio::main]
async fn main() {
    let cluster_config = NodeTcpConfigBuilder::new()
        .with_contact_point("127.0.0.1:9042".into())
        .build()
        .await
        .unwrap();
    let session = TcpSessionBuilder::new(RoundRobinLoadBalancingStrategy::new(), cluster_config)
        .build()
        .await
        .unwrap();

    let create_ks = "CREATE KEYSPACE IF NOT EXISTS test_ks WITH REPLICATION = { \
                     'class' : 'SimpleStrategy', 'replication_factor' : 1 };";
    session
        .query(create_ks)
        .await
        .expect("Keyspace create error");
}

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.