http://cloudaeon.co.uk/blog/the-rapid-growth-of-retail-cloud-computing
retail cloud market size

Apache Hadoop has gained popularity in the storage, management, and processing of large amounts of data because it can handle large volumes of highly structured data. However, Hadoop cannot handle random high-speed writing and reading and cannot change files without completely rewriting. HBase is a column-based NoSQL Hadoop database that overcomes the shortcomings of HDFS by enabling fast arbitrary writing and reading in an optimized way.