title: MapReduce intermediate data output location
body: <p>You have just executed a MapReduce job. Where is intermediate data written to after being emitted from the Mapper’s map method?      </p>
  
  <ul>
  <li><strong>A.</strong> Intermediate data in streamed across the network from Mapper to the Reduce and is never written to disk.      </li>
  <li><strong>B.</strong> Into in-memory buffers on the TaskTracker node running the Mapper that spill over and are written into HDFS.      </li>
  <li><strong>C.</strong> Into in-memory buffers that spill over to the local file system of the TaskTracker node running the Mapper.      </li>
  <li><strong>D.</strong> Into in-memory buffers that spill over to the local file system (outside HDFS) of the TaskTracker node running the Reducer      </li>
  <li><strong>E.</strong> Into in-memory buffers on the TaskTracker node running the Reducer that spill over and are written into HDFS.</li>
  </ul>