Testing Mapper
Explore how to verify the CarMapper class in MapReduce through unit testing. Understand using Java frameworks like MRUnit to test input-output mappings, ensuring reliable processing in distributed Big Data environments.
We'll cover the following...
We'll cover the following...
Testing Mapper
In the previous section, we wrote our CarMapper class. It takes in a long offset and a string line as input key-value pairs. The class then splits out car brand names and a count (always 1) as intermediate key-value pairs for the reducer function to consume. When developing code, we need to test it along the way. However, debugging and testing map reduce take a departure from the traditional testing and debugging of Java applications because of its distributed ...