March 2018
Beginner to intermediate
308 pages
8h 23m
English
Content preview from Seven NoSQL Databases in a Week
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HDFS
HDFS is the Hadoop Distributed File System. Modeled on GFS, Google File System, it allows the storage and processing of large amounts of data. HDFS is modeled as a file system, with support for files larger than what could fit on a single machine. Files are stored as collections of blocks, spread out across a collection of machines.
The data blocks are stored at DataNodes, which handles all of the I/O for the blocks they are responsible for. The block assignment metadata is stored at the NameNode. The NameNode is responsible for admin and meta operations, such as creating directories, listing directories, file moves, and so on. The HDFS client implements the file system interface and provides client applications the logical abstraction ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.