On MapReduce, Java and patterns

Some thoughts after reading "MapReduce Design Patterns" book

Many years ago I read GoF book on design patterns, and I really liked it a lot, as it showed me many things I invented some months or even years ago (and thus I knew them already), but GoF book gave them names, and provided me with acknoledgment that my inventions are reasonable. - From these days, I like pattern-based approach to the development...