Duckduckgo was/is using Solr http://highscalability.com/blog/2013/1/28/duckduckgo-architecture-1-million-deep-searches-a-day-and-gr.html http://highscalability

Duckduckgo was/is using Solr http://highscalability.com/blog/2013/1/28/duckduckgo-architecture-1-million-deep-searches-a-day-and-gr.html http://highscalability.com/blog/2013/1/28/duckduckgo-archite...