Explanation:As a MapReduce application writer, you don’t need to deal with InputSplits directly, as they are created by an InputFormat. 7. ______________ is another implementation of the MapRunnable interface that runs mappers concurrently in a configurable number of threads.
A. MultithreadedRunner
B. MultithreadedMap
C. MultithreadedMapRunner
D. SinglethreadedMapRunner
Answer:A
Explanation:As a MapReduce application writer, you don’t need to deal with InputSplits directly, as they are created by an InputFormat. 7. ______________ is another implementation of the MapRunnable interface that runs mappers concurrently in a configurable number of threads.
A. MultithreadedRunner B. MultithreadedMap C. MultithreadedMapRunner D. SinglethreadedMapRunner
Explanation:A RecordReader is little more than an iterator over records, and the map task uses one to generate record key-value pairs, which it passes to the map function. 8. Which of the following is the only way of running mappers ?