Design a system to efficiently calculate the top 1MM Google search queries and create a report of these. Additionally:
- You are given twelve servers
- Each has two processors, 4GB of ram and four 400GB hard drives.
- The machines are networked
- The log data as roughly 100 Billion log lines in it.
- The log data comes in twelve, 320 Gb files.
- Each line of the files has roughly 40 search queries
- You can only use open source software or software that you write.