May 2017
Intermediate to advanced
294 pages
7h 33m
English
Content preview from Apache Spark 2.x Cookbook
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Understanding the Parquet format
the Google Dremel paper. In Parquet, data in a single column is stored contiguously.
Apache Parquet is a columnar data storage format, specifically designed for big data storage and processing. It is based on record shredding and the assembly algorithm from the Google Dremel paper. In Parquet, data in a single column is stored contiguously. The columnar format gives Parquet some unique benefits. For example, if you have a table with 100 columns and you mostly access 10 columns in a row-based format, you will have to load all the 100 columns, as the granularity level is at the row level. But, in Parquet, you will only need to load 10 columns. Another benefit is that since all of the data in a given column is ...
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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.