Supporting set-valued joins in NoSQL using MapReduce

NoSQL systems are increasingly adopted for Web applications requiring scalability that relational database systems cannot meet. Although NoSQL systems have not been designed to support joins, as they are applied to a wide variety of applications, the need to support joins has emerged. Furthermore, joins performed in NoSQL systems are generally similarity joins, rather than exact-match joins, which find similar pairs of records. Since Web applications often use the MapReduce framework, we develop a solution to perform similarity joins in NoSQL systems using the MapReduce framework.