HDFS is a Java-based file system that provides scalable and reliable data storage, and it was designed to span large clusters of commodity servers. HDFS has demonstrated production scalability of up to 200 PB of storage and a single cluster of 4500 servers, supporting close to a billion files and blocks.
Periscope Data is a data analysis platform designed specifically for data scientists. Periscope plugs directly into your SQL-based databases and lets you run, save and share analysis over billion of data rows in seconds.