Another common scenario is to read, insert, or update existing data in a NoSQL database. Such systems are usually used to drive real-time applications such as an Analytics platform, or store and provide traversal capabilities to a graph database.
Fortunately, a lot of taps are available, and Cascading provides a number of extensions for popular NoSQL databases such as MongoDB, Cassandra, ElaphantDB, and HBase. A brief introduction to these NoSQL systems follows:
MongoDB: This is a document-oriented database that uses JSON-like documents with dynamic schemas and is the most popular NoSQL database.
Cassandra: This is a highly distributed database capable of spanning over multiple data centers that aims to provide low latency for real-time applications. It uses a flat hierarchy across nodes architecture and is not dependent on Hadoop applications or HDFS.
ElephantDB: This is a distributed database specializing in exporting key-value data from Hadoop. The library
elephantdb-cascading...