Apache Cassandra review

Apache Cassandra is an open-source distributed NoSQL database for storing large amounts of data across multiple machines. Its masterless design gives every node the same role, avoiding a single point of failure. Teams can run it on their own infrastructure, including cloud or on-premises deployments, and replicate data across data centers.

Cassandra is built to scale as a cluster grows: its feature description says read and write throughput increase linearly as machines are added, and that nodes can be added without downtime or application interruption. Operators can choose synchronous or asynchronous replication for updates. Audit logging tracks DML, DDL, and DCL activity, with minimal impact on normal workloads, according to the published feature details.

The listed self-hosted software price is $0 per month under the Apache License 2.0. That covers the software, not the infrastructure or work required to operate it. Monthly and annual billing, a free trial, and a starting price for any other offering are not published on the vendor's site.

Cassandra’s clearest fit is data that needs to stay available across a distributed system. Its masterless architecture means there is no designated master node to become a single point of failure, while replication across data centers is designed to help a cluster survive regional outages. Those are concrete architectural strengths for teams with multi-data-center requirements, not a guarantee that every deployment will meet its availability targets.

The published feature details also make a case for growth without planned downtime: Cassandra streams data between nodes when adding nodes or data centers, and read and write throughput are described as scaling linearly as machines are added. Flexible replication lets teams choose synchronous or asynchronous replication for each update. Audit logging covers DML, DDL, and DCL activity, with minimal impact on normal workloads according to the feature description.

There is no software subscription price in the listed self-hosted option. In one Reddit thread comparing Cassandra with ScyllaDB, commenters describe Cassandra as having an extensive user base and point to contributions from multiple organizations and users. That is community discussion, not a guarantee of support for your particular stack.

Free software does not mean a free database service. The listed $0-per-month option is for teams managing their own infrastructure; the published pricing information gives no infrastructure estimate, paid support price, managed-plan price, or free-trial terms. It also publishes no node, storage, or throughput caps. Those limits are therefore unknown here—not evidence that capacity is unlimited.

Self-hosting puts cluster operations on your team. A commenter in an r/aws discussion about managing Cassandra and Scylla clusters described the work as annoying even with custom tooling. That is one user’s report, but it flags the trade-off: Cassandra’s scaling and replication features still require people to run and maintain the deployment.

Cassandra should not be treated as a long-term disaster-recovery plan by itself. In an r/ceph thread about retaining important data for 10 years, a commenter advised ongoing maintenance or a separate DR solution. The discussion also raised workload fit: other commenters recommended object storage for the image-storage use case. The published material does not publish a retention guarantee or backup cap, so confirm those requirements separately before choosing Cassandra.

Apache Cassandra’s listed self-hosted open-source plan is $0 per month and free to download under the Apache License 2.0, according to the pricing information checked on November 7, 2026. There is no paid tier in the published pricing data, so there is no tier jump to budget for. No add-ons are listed.

That does not make running Cassandra cost-free. The $0 price covers the software, not the infrastructure or the people needed to manage it. Cassandra can run on commodity hardware, cloud infrastructure, or on-premises, but the published material gives no infrastructure prices, support fees, or staffing estimates. Those costs are not published here.

A billing gotcha: the pricing data lists $0 per month, but says no monthly or annual billing is published. Treat the figure as the software’s price, not a hosted-service quote. The published information does not list a hosted plan, paid support plan, or separate disaster-recovery charge.

The published material does not document a migration path, data-export tools, or compatibility with other databases, so we can’t put a reliable effort estimate on a move. Before switching, map how your application writes and reads data, how replication is configured across data centers, and who will operate the cluster. Cassandra’s masterless design and online scaling are product features, not a promise that moving existing data or changing applications is automatic.

The Apache License 2.0 and free-to-download software reduce licensing dependence on a vendor, but they do not remove the work of running the database. Teams that do not want to manage infrastructure may find that operational burden a reason to leave; that follows from the product’s self-managed model, not from Reddit reports. No Reddit posts or comments were included in the published material, so we can’t responsibly summarize reported reasons people leave. Export formats and exit procedures are not published on the vendor's site; confirm them before planning a migration.