Hadoop_TheDefinitiveGuide - (EPUB全文下载)

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Hadoop: The Definitive Guide
Tom White
For Eliane, Emilia, and Lottie
Foreword
Doug Cutting, April 2009
Shed in the Yard, California
Hadoop got its start in Nutch. A few of us were attempting to build an
open source web search engine and having trouble managing computations
running on even a handful of computers. Once Google published its GFS and
MapReduce papers, the route became clear. They’d devised systems to solve
precisely the problems we were having with Nutch. So we started, two of us,
half-time, to try to re-create these systems as a part of Nutch.
We managed to get Nutch limping along on 20 machines, but it soon
became clear that to handle the Web’s massive scale, we’d need to run it on
thousands of machines, and moreover, that the job was bigger than two
half-time developers could handle.
Around that time, Yahoo! got interested, and quickly put together a
team that I joined. We split off the distributed computing part of Nutch,
naming it Hadoop. With the help of Yahoo!, Hadoop soon grew into a
technology that could truly scale to the Web.
In 2006, Tom White started contributing to Hadoop. I already knew Tom
through an excellent article he’d written about Nutch, so I knew he could
present complex ideas in clear prose. I soon learned that he could also
develop software that was as pleasant to read as his prose.
From the beginning, Tom’s contributions to Hadoop showed his concern
for users and for the project. Unlike most open source contributors, Tom is
not primarily interested in tweaking the system to better meet his own
needs, but rather in making it easier for anyone to use.
Initially, Tom specialized in making Hadoop run well on Amazon’s EC2
and S3 services. Then he moved on to tackle a wide variety of problems,
including improving the MapReduce APIs, enhancing the website, and devising
an object serialization framework. In all cases, Tom presented his ideas
precisely. In short order, Tom earned the role of Hadoop committer and soon
thereafter became a member of the Hadoop Project Management
Committee.
Tom is now a respected senior member of the Hadoop developer
community. Though he’s an expert in many technical corners of the project,
his specialty is making Hadoop easier to use and understand.
Given this, I was very pleased when I learned that Tom intended to
write a book about Hadoop. Who could be better qualified? Now you have the
opportunity to learn about Hadoop from a master — not o ............

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