The word "groups" in the phrase "groups like data" can be either a verb or a plural noun; change "like" to "similar" to eliminate the ambiguity
Typo (grock -> grok) and missing whitespace (ever present)
Capitalizing "Ring" seems awkward here, especially to Tolkien fans
Using "while" here feels like a counterpoint: "Riak is highly available but tolerant of outages"