May 2017
Intermediate to advanced
294 pages
7h 33m
English
Content preview from Apache Spark 2.x Cookbook
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How it works...
Let's spend some time understanding the Parquet format at a deeper level. The following is some sample data represented in a table format:
| First_Name | Last_Name | Age |
| Barack | Obama | 55 |
| George | Bush | 70 |
| Bill | Clinton | 70 |
In the row format, the data will be stored like this:
| Barack | Obama | 55 | George | Bush | 70 | Bill | Clinton | 70 |
In the columnar layout, the data will be stored like this:
| Barack | George | Bill | Obama | Bush | Clinton | 56 | 70 | 70 |
The following diagram illustrates how the data is laid out in a file:
Here's a brief description of the different parts:
- Row group: This shows the horizontal partitioning of the data into ...
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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.