April 2015
Beginner to intermediate
194 pages
4h 18m
English
Content preview from Hadoop EssentialsBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Spark architecture
Spark architecture is based on a DAG engine and its data model works on Resilient Distributed Dataset (RDD), which is its USP with a large number of benefits in terms of performance. In Spark the computations are performed lazily, which allows the DAG engine to identify the step or computation that is not needed for the end result and is not performed at all, thus improving performance.
Directed Acyclic Graph engine
Spark has an advanced DAG engine that manages the data flow. A job in Spark is transformed in a DAG with task stages and the graph is then optimized. The tasks identified are then analyzed to check if they can be processed in one stage or multiple stages. Task locality is also analyzed to optimize the process.
Resilient ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
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.