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.
FTPS (also known FTP-SSL, and FTP Secure) is a secured extension to the commonly used File Transfer Protocol that provides secured file access, file transfer, and file management over any reliable data stream.