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You write MapReduce job to process 100 files in HDFS. Your MapReduce algorithm uses TextInputFormat: The mapper applies a regular expression over input values and emits key-values pairs with the key consisting of the matching text, and the value containing the filename and byte offset. Determine the difference between setting the number of reduces to one and settings the number of reducers to zero.

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You write MapReduce job to process 100 files in HDFS. Your MapReduce algorithm uses TextInputFormat: The mapper applies a regular expression over input values and emits key-values pairs with the key consisting of the matching text, and the value containing the filename and byte offset. Determine the difference between setting the number of reduces to one and settings the number of reducers to zero.






 
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