[dekhn]

CERN was doing the equivalent of MapReduce before Google existed.

[wbl]

Got a link? HEP data is really about triggers and widely distributed screening that's application specific AFAIK.

[dekhn]

My main reference is the head of computing at CERN, who explained this to me. He gave some early examples of ROOT (https://en.wikipedia.org/wiki/ROOT) using parallel processing of the ROOT equivalent of SSTables.