October 2015
Intermediate to advanced
288 pages
7h 35m
English
Content preview from Clojure Recipes
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16. Writing Out a Data File with Cascalog
In this chapter we cover writing a data file out of Cascalog.
Assumptions
In this chapter we assume you have Leiningen set up.
Benefits
The benefit of this chapter is understanding and applying the fact that Hadoop is a batch processing system that writes the results of its computation to a data sink somewhere. In this chapter, we’ll write it to a file.
The Recipe—Code
Now we’ll look at reporting the results out of Cascalog to a file.
1. Create a new Leiningen project cascalog-file-output in your projects directory, and change to that directory:
lein new app cascalog-file-output cd cascalog-file-output
2. Ensure that the following is in your projects.clj file:
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