More specifically, Amazon Elastic MapReduce (EMR) beat Google to market. By years, if I recall correctly.

Does the downvote indicate my memory is faulty?

I believe I was already using EMR when Google's MapReduce service was announced. I'm not referring to their internal tool, but the external service.

EMR beat Google Cloud MapReduce to market, but you're forgetting that before there was such a thing as cloud services, we relied on open-source frameworks and setup our own clusters. EMR is based on an open-source framework called Hadoop, which itself was built on a closed-source Google framework called MapReduce that Google released a paper about. MapReduce came out in 2003, Hadoop in 2006, Amazon EMR in 2009, and Cloud MapReduce in 2015.

...which is sorta my point. People remember the version of the technology that makes it accessible to them, not the first one that comes out. When Google keeps thing proprietary forever and only releases academic papers, people quickly forget just how far ahead they were.

That's all true, but what may matter more to Google was the missed business opportunity of being first to market with a relatively easy distributed computing paradigm.

That's exactly backwards - the MapReduce paper was intentionally released as vaporware to make the rest of the industry spin its gears trying to replicate an imaginary result. And that's why we have Hadoop.

You realize you're arguing with an ex-Googler who has worked on production MapReduces that were first written around 2005 and has read the initial MapReduce commit?

I thought the MR paper described an actual working implementation. It had performance test results, descriptions of issues they encountered and solved, and some sample source code of how MR is used. It seems like a lot of effort was put in for it to be a hoax.