February 2017
Intermediate to advanced
274 pages
5h 58m
English
Content preview from Learning PySpark
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Executing simple queries
Let's start with a set of simple graph queries to understand flight performance and departure delays.
Determining the number of airports and trips
For example, to determine the number of airports and trips, you can run the following commands:
print "Airports: %d" % tripGraph.vertices.count() print "Trips: %d" % tripGraph.edges.count()
As you can see from the results, there are 279 airports with 1.36 million trips:
Determining the longest delay in this dataset
To determine the longest delayed flight in the dataset, you can run the following query with the result of 1,642 minutes (that's more than 27 hours!):
tripGraph.edges.groupBy().max("delay") ...Become 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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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.