When was the first version of Hadoop released? [closed]

Question

When was the first version of Hadoop released to the public? Any supporting links?
Edit
I should have been more clear - I'm asking this question because the Wikipedia article, the best source I could find on Hadoop, was not clear about when the program was first available to the public.

Answer 1

Trivial method to find answer is to look at http://hadoop.apache.org/mapreduce/releases.html based on which the earliest release is on September 4, 2007.

But if you want to look at how the page looked way back then here is the earliest scraped page available on wayback machine: http://web.archive.org/web/20080123212822/http://hadoop.apache.org/core/releases.html