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by haberman 3011 days ago
I don't think they are successors, just different. Protobuf is a sparse wire format, whereas FlatBuffers and Cap'n Proto use a fixed-layout wire format. There are plusses and minuses to both. I wrote a little bit about this here: https://news.ycombinator.com/item?id=6329041#6330426

(Disclosure: I work at Google on the protobuf team)