The right level of parallelism for maps seems to be around . . . . . . . . maps per-node.

What is the purpose of the Mapper class in a MapReduce application?

A. Generate intermediate key-value pairs

B. Read and parse input data

C. Aggregate values on the reducer side

D. Execute MapReduce jobs

In a MapReduce job, what does the term "Reducer" refer to?

A. Task that processes the Map output

B. Task that processes the Reduce output

C. Task that processes the Map input

D. Task that processes the Reduce input

What is the role of the Partitioner in a MapReduce application?

A. Distribute data across multiple nodes

B. Sort and shuffle data

C. Combine intermediate key-value pairs on the mapper side

D. Determine the reducer for each key

In a MapReduce program, what is the purpose of the Hadoop Configuration object?

A. Manage computation resources

B. Set job-level configurations

C. Execute MapReduce jobs

D. Read and parse input data