Infinispan vs Memcached

Infinispan is a free, open-source distributed in-memory database that combines caching with full-text and vector search. Its search capabilities include distributed vector indexes, kNN similarity queries, semantic search, retrieval-augmented generation, and semantic caching. Applications can connect through Hot Rod, REST, Redis, or Memcached, with listed client libraries for Java, Go, JavaScript, C++, .NET, and Python. It can run as an embedded library, standalone server, or container image. Deployment options include a Kubernetes Operator and container images on OpenShift, AWS EC2, Azure, and GCP. Listed cache stores include filesystem, JDBC, SQL, RocksDB, and remote Infinispan clusters. Security features include role- and permission-based access control, security realms, and encryption for inter-cluster traffic and remote endpoints. It supports distributed transactions with optimistic or pessimistic locking, configurable isolation levels, and XA recovery. Native integrations listed include Spring AI, LangChain4j, LangChain, and Quarkus LangChain4j. Infinispan is released under the Apache 2.0 license. Its support policy covers only the latest minor release of a major version, with full, limited, and limited-client support distinctions.

Memcached is a free, self-hosted in-memory key-value cache for reducing database load in dynamic web applications. It keeps small chunks of arbitrary data, such as strings, objects, and results from database calls, API calls, or page rendering. Clients use key-based hashing to choose a server, while servers operate independently without synchronization or replication. Items can expire after a specified time, and the default eviction policy is least recently used (LRU). The project describes Memcached as a developer tool, not code acceleration software or database middleware. Its API is available for most popular languages, and downloads include a source tarball and installation instructions with package prerequisites for Debian/Ubuntu and Red Hat/CentOS. TLS authentication and encryption are supported in version 1.5.13 and later when built with TLS and used with a TLS-capable client. Optional extstore moves values to external storage while keeping keys and the hash table in memory; it needs version 1.6.0 or newer. The project began in 2003. It is free and self-hosted, with no hosted plan or price listed.