You need to perform statistical analysis in your MapReduce job and would like to call methods in the Apache Commons Math library, which is distributed as a 1.3 megabyte Java archive (JAR) file. Which is the best way to make this library available to your MapReducer job at runtime?
A) Have your system administrator copy the JAR to all nodes in the cluster and set its location in the HADOOP_CLASSPATH environment variable before you submit your job.
B) Have your system administrator place the JAR file on a Web server accessible to all cluster nodes and then set the HTTP_JAR_URL environment variable to its location.
C) When submitting the job on the command line, specify the -libjars option followed by the JAR file path.
D) Package your code and the Apache Commands Math library into a zip file named JobJar.zip

Question

Quizplus · Accepted Answer

Using the -libjars option when submitting the job allows you to include additional JAR files that are needed by your MapReduce job, ensuring they are available on all nodes at runtime.

You Need to Perform Statistical Analysis in Your MapReduce Job