The goal is to expand on our Word Count example in Cascading, adding a custom function to calculate TF-IDF. This shows how to use a sumby and also a cogroup.
We'll keep building on this example to show features related to TDD and "local" mode.
More detailed background information and step-by-step documentation is provided at https://github.com/ConcurrentCore/impatient/wiki
To generate an IntelliJ project use:
To build the sample app from the command line use:
gradle clean jar
Before running this sample app, be sure to set your
HADOOP_HOME environment variable. Then clear the
output directory, then to run on a desktop/laptop with Apache Hadoop in standalone mode:
rm -rf output hadoop jar ./build/libs/impatient.jar data/rain.txt output/wc data/en.stop output/tfidf output/trap output/check
To view the results:
more output/tfidf/part-00000 more output/trap/part-m-00001-00000 more output/check/part-00000
An example of log captured from a successful build+run is at https://gist.github.com/3044049
For more discussion, see the cascading-user email forum.
Stay tuned for the next installments of our Cascading for the Impatient series.