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Project Voldermort and Terrastore: Key-Value vs Document Stores

It is an apples to oranges comparison, but it underlines, from a beginner perspective, the major differences between a pure key-value store (Project Voldemort) and a document database (Terrastore):

Being a simpler KV store than Terrastore, to my understanding Project Voldemort offers no ability to leverage the server to evaluate the Values. In order to, for example, produce a list of documents whose “publish date” is in the past, it is necessary to either fetch all documents and evaluate the publish date each time this operation is needed — or — manage a lookup list of document IDs that were “published” when the lookup list was created.

In the end, the author also emphasizes how important the first impression is: clean documentation, simple installation, etc.. Or differently put, an end user judges a project by how fast he can start using it.

Original title and link: Project Voldermort and Terrastore: Key-Value vs Document Stores (NoSQL databases © myNoSQL)