Staff training asks for the correct order of MapReduce stages for a batch 311 analytics job. Which sequence is correct?
Select an answer to reveal the explanation.
Short Explanation
Slice the mail, stamp each piece, sort by address, then tally per route, then file the totals. MapReduce follows that rhythm: split, map, shuffle/group, reduce, output. Starting with reduce or output first scrambles the pipeline.
Full Explanation
MapReduce processes data by splitting inputs, running maps, shuffling and grouping intermediate keys, running reducers, then writing output. That sequence is fundamental BDPC knowledge. Orders that begin with reduce or output, or that delete HDFS mid-pipeline as a required stage, are incorrect.