Apache Ignite

What Apache Ignite is

Apache Ignite is an open-source, memory-first distributed SQL database for high-velocity workloads. It supports ACID transactions across partitions through Raft consensus, while MVCC snapshot isolation enables non-blocking reads. Data uses memory as the primary tier, with persistence available through AIPERSIST. SQL access includes JDBC drivers, a Table API, and native APIs. Catalog-driven schema management allows changes such as adding columns or modifying indexes without stopping the cluster. DataStreamer handles high-throughput writes with backpressure control. Native clients are listed for Java, .NET, C++, and Python, and extensions are available for AWS, Azure, GCE, and Spring. Operational features include authentication, SSL/TLS security, OpenTelemetry metrics, recovery snapshots, and backups. Listed uses include event stream processing, microservices state management, session management, and AI/ML feature stores. Ignite supports JDBC, REST, its binary client protocol, SQL, language APIs, and key-value access. It is self-hosted and free, with binary, source, Docker, and Maven/Gradle options. Ignite 2 is identified as a long-term support release for existing deployments.