In Pictures: 18 essential Hadoop tools for crunching big data

Making the most of this powerful MapReduce platform means mastering a vibrant ecosystem of quickly evolving code

ZooKeeper Once Hadoop runs on more than a few machines, making sense of the cluster requires order, especially when some of the machines start checking out.

ZooKeeper imposes a file system-like hierarchy on the cluster and stores all of the metadata for the machines so you can synchronize the work of the various machines. (The image at left shows a simple two-tiered cluster.) The documentation shows how to implement many of the standard techniques for data processing, such as producer-consumer queues so the data is chopped, cleaned, sifted, and sorted in the right order. The nodes use ZooKeeper to signal each other when they're done so the others can start up with the data.

For more information, documentation, and the latest builds turn to

9 of 19

Comments on this image

There are currently no comments for this image.

Comments are now closed.

Related Slideshows

Most Popular Reviews

Follow Us

Best Deals on GoodGearGuide

Latest News Articles


GGG Evaluation Team

Kathy Cassidy


First impression on unpacking the Q702 test unit was the solid feel and clean, minimalist styling.

Anthony Grifoni


For work use, Microsoft Word and Excel programs pre-installed on the device are adequate for preparing short documents.

Steph Mundell


The Fujitsu LifeBook UH574 allowed for great mobility without being obnoxiously heavy or clunky. Its twelve hours of battery life did not disappoint.

Andrew Mitsi


The screen was particularly good. It is bright and visible from most angles, however heat is an issue, particularly around the Windows button on the front, and on the back where the battery housing is located.

Simon Harriott


My first impression after unboxing the Q702 is that it is a nice looking unit. Styling is somewhat minimalist but very effective. The tablet part, once detached, has a nice weight, and no buttons or switches are located in awkward or intrusive positions.

Latest Jobs

Don’t have an account? Sign up here

Don't have an account? Sign up now

Forgot password?