The text discusses the evolving role of NoSQL databases, particularly MongoDB and Couchbase Server, in the context of big data solutions. While MongoDB is recognized as a part of the big data ecosystem and is planning integration with Hadoop, it is characterized as suitable for first-generation solutions that focus on basic data import and export without real-time analysis or significant scalability considerations. In contrast, Couchbase Server, while not positioned directly as a big data solution like Hadoop, offers a more comprehensive approach by supporting both operational and analytical requirements, enabling second-generation solutions that incorporate real-time processing and integration with technologies like Elasticsearch and Storm. The text highlights examples such as AOL and LivePerson that leverage Couchbase for targeted advertising and high-throughput requirements, illustrating its capability to meet the demands of modern big data architectures.