OK, so, to be more precise:

Hadoop MapReduce does what Google MapReduce does, and Hadoop Distributed File System does what the Google Filesystem does.

And Apache Spark does the same thing as that other Google product whose name I forget.

And Drill vs Dremel, etc etc etc.

I think that the OP is plenty right for the purposes of the point they were making. And I think (from a non-Googler's perspective) that it's a worthwhile point, since the FOSS ecosystem has since evolved along similar lines to Google's internal tools.

Apache Spark does what Google FlumeJava does, express a chain of map/reduce steps in a DSL (and inline away some intermediate results).

Apache Flume is unrelated except for the confusing name.