DOWNLOAD MRUNIT JAR

It is because the mapDriver will only test the mapper logic. We need to add that jar to the build path. Asked 3 years, 2 months ago. Click on Add external Jar file and add the jar file you recently downloaded. If you are familiar with JUnits then you will find unit testing for MapReduce jobs also follows the same pattern. Join 36 other followers Follow. Unzip the folder and you will find mrunit jar file inside the lib directory.

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In order to make sure that your code is correct, you need to Unit test your code first. Click on Add external Jar file and add the jar file you recently downloaded.

But I really don't think there is need to show the stack trace.

Unicorn Meta Zoo 9: Therefore we need ajr set both the mapper and reducer class to the mapReduceDriver. If you are familiar with JUnits then you will find unit testing for MapReduce jobs also follows the same pattern. How do we handle problem users? You are commenting using your Twitter account. Therefore we need to set both the mapper and reducer class to the mapReduceDriver.

If the mapper, reducer and mapReduce job as a whole is correct, then you should get an output where you see no errors or failures. Archives November September August July Archives November September August July Thanks for your reply.

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Have you tried setting dependency to 1. Create a new configuration and you are ready to test the mapper. In order to make sure that your code is correct, you need to Unit test your code first. By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

Download JAR files with all dependencies

The reducer code is then supposed to give the final ouput with word as key and its count as value. We need to add that jar to the build path. After a few hours' inefficient research by myself, got the answer from my Colleague: Note that we are not setting the reducer class. This is the code that runs before any and every test runs and can be used for all the initializations that you want to do. Unzip the folder and you will find mrunit jar file inside the lib directory.

Declare the drivers Instead of running the actual driver class, for unit testing we will declare drivers to test mapper, reducer and the whole MapReduce job.

Testing your MapReduce programme with MRUnit – My Tech Blog

jwr In order to test the complete MapReduce job, we give the input offset as key and line of text as value to the mapReduceDriver. To test the reducer functionality we use the code given below. Join 36 other followers Follow. Notify me of new comments via email.

Run the test for your reducer. The reducer code is then supposed to give the final ouput with word as key and its count as value. If the mapper pass the test. Notify me of new posts via email. Asked 5 years ago.