I'm not sure that I understand your point. It seems very reasonable to me to consider a raw HDFS as a type of NoSQL data storage mechanism, with other component

I'm not sure that I understand your point. It seems very reasonable to me to consider a raw HDFS as a type of NoSQL data storage mechanism, with other components of the Hadoop framework acting on top of it as query languages and other utilities. Of course we can bikeshed all day and split hairs about the precise definitions, but in the spirit of pragmatism, I would absolutely put "Hadoop" as a form of NoSQL storage solution. In fact, I'd say the most distinct of the items mentioned is Redis, and Redis is the tool from this list that has use cases that tend to differ the most significantly from traditional RDBMSs (I'm thinking specifically cases where Redis is used as a buffering layer to help relieve congestion for a highly visited base data store). But even so, I still don't think it represents any sort of taxonomic error to put them all in the NoSQL category, at least for practical purposes.