Use Case: We have 1 million files to process and provide option to download.
Hadoop is meant to bring process to data. We can store processed file content or meta data in HBase to support easy search. Upon successful search, user want to see original document. During that time we can download file from NAS easily.
HDFS: This is not meant to store large files. 16MB is block size. We can configure to support to store small files. But not supposed to be.
HBase: Default block size is 100kb. We can tweak, but not meant to store proprietary data formats.
NAS: Network Attached Storage is easy to store/retrieve original files, When we don’t have map reduce nature of jobs.