VMware Tanzu GemFire is a commercial in-memory data grid powered by Apache Geode. GemFire provides low-latency, highly concurrent, in-memory access to tens of terabytes of operational data spread across a cluster, or multiple clusters of nodes in different data centers, using a horizontally scalable, "shared nothing" architecture. GemFire ensures data consistency both within and across clusters (data centers). GemFire's event driven architecture is a good fit for microservices based applications because changes to data in one microservice can be published to any number of subscribing microservices.