Clarify Hadoop's advantages over a database

[mrflip]

From @kromerma reading first few chapters:

First chapters feedback

• explain locality means disk head moving & also computer-computer moving
• put in "numbers everyone should know"
• move first section to end
• expand on the "Hadoop is good at" list: unruly, huge, connected, dimensional

• using the wikip data, show things db is good at & move to progressively less and less

  • dimensional: with lots of properties am effectively making table on fly
  • connected: flights -> airports -> geo -> weather stations -> weather // time
• in "since there have been ten computers" part: Don't use phrase "talk to", say "Access data from"

After E&C Inc. save xmas:

Walk through carefully the geo-flavor example:

• chimpanzee is labelling records to go to same place
• ... turning one record into zero one or many (spam, solo, gift for me & sis)
• (also, unstructured => structured)
• practical example: market basket analysis