Machine Learning with R Cookbook - Second Edition
by AshishSingh Bhatia, Yu-Wei, Chiu (David Chiu)
How it works...
In this recipe, we introduced some debugging and testing techniques you can use while implementing the MapReduce program. First, we introduced the technique to test a MapReduce program in a local mode. If you would like to run the MapReduce program in a pseudo-distributed or fully-distributed mode, it would take you a few minutes to several hours to complete the task, which would involve a lot of wastage of time while troubleshooting your MapReduce program. Therefore, you can set the backend to the local mode in rmr.options so that the program will be executed in the local mode, which takes lesser time to execute.
Another debugging technique is to list the content of the variable within the map or reduce function. In an R ...
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