Apache HBase

HBase is the Hadoop database. It is a distributed, scalable, big data store. It provides random, real-time read/write access to your Big Data.

When to Use

Billion-Row Distributed Big Data Storage: Storing petabytes of structured/semi-structured data on top of Hadoop HDFS.
Real-Time Read/Write Access on Big Data: Serving random, real-time read and write lookups against massive Hadoop datasets.
Sparse Wide-Column Datasets: Managing tables with millions of columns where individual rows populate only a small subset of fields.
Tight Apache Hadoop / Spark Ecosystem Integration: Running distributed map-reduce and Spark streaming jobs natively over HBase tables.

Uses Java API or Shell.