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______________ 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: c
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.

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