How to Write a MapReduce Program
- We determine if we’ve found a global minimum delta, and if so, assign the min and minYear .
- We will need to define a Mapper class, Reducer class and a Driver class.
- The output of the reducer class must both conform to our solution requirements as well as match up to the data types specified in the source code.
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@KirkDBorne: “How to Write a MapReduce Program: #Hadoop #BigData #Analytics by @mapr”
In this blog post we detail how data is transformed as it executes in the MapReduce framework, how to design and implement the Mapper, Reducer, and Driver classes; and execute the MapReduce program. In order to write MapReduce applications you need to have an understanding of how data is transformed as it executes in the MapReduce framework. From start to finish, there are four fundamental transformations.
How to Write a MapReduce Program | MapR