The REDUCE phase needs to download intermediate pairs produced by the mappers. How can we reduce the
The REDUCE phase needs to download intermediate pairs produced by the mappers. How can we reduce the cost of this exchange? The following gives some hints: 1. Consider again the WordCount example; Propose a post-processing step, running on the mapper, that reduces the size of the files sent to the reducers. 2. Now, consider a MAPREDUCE task aiming at retrieving the inverse document frequency; does the foregoing optimization still help? 3. Finally, one could sort the intermediate pairs before sending them to the reducer; discuss the pros and cons of this approach. Apr 23 2022 08:23 AM
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