CockroachDB vs YugabyteDB

CockroachDB and YugabyteDB are the two leading Spanner-inspired distributed SQL databases. Both provide horizontal scaling with strong consistency but differ in design philosophy and API support.

Architecture Differences

CockroachDB uses a monolithic architecture where each node runs a single process handling SQL, distribution, replication, and storage. Data is split into ranges (64MB default) replicated via Raft. The leaseholder mechanism allows efficient local reads.

YugabyteDB separates concerns into YB-TServer (tablet server for data storage) and YB-Master (cluster coordination, metadata). Data is split into tablets replicated via Raft. YugabyteDB offers two query layers: YSQL (PostgreSQL-compatible) and YCQL (Cassandra-compatible).

Performance Characteristics

Both provide similar OLTP performance for distributed transactions. CockroachDB's leaseholder reads avoid consensus for reads, providing lower read latency. YugabyteDB offers configurable follower reads for reduced latency at the cost of slightly stale data.

YugabyteDB's YCQL API provides Cassandra-like performance for key-value workloads without distributed SQL overhead, giving it a multi-model advantage.

Trade-offs

CockroachDB's serializable isolation is the strongest default consistency level among distributed SQL databases. YugabyteDB defaults to snapshot isolation, which is sufficient for most applications but allows certain anomalies that serializable prevents.

YugabyteDB's dual API (YSQL + YCQL) is unique: you can use SQL for complex queries and the Cassandra-compatible API for high-throughput key-value operations on the same data. CockroachDB is SQL-only.

Licensing

YugabyteDB is fully Apache 2.0 licensed, meaning all features are open source. CockroachDB uses BSL (Business Source License), which restricts offering CockroachDB as a service. For organizations with strict open-source requirements, this matters.

Real-World Usage

CockroachDB runs at DoorDash, Netflix, and Bose. YugabyteDB powers Kroger, Wells Fargo, and Nutanix. Both handle mission-critical transactional workloads at scale.

Learn about distributed transactions and Raft consensus. See our system design guide and pricing.