It’s all about Map Reduce – Part-2
Record writers, a function in the reducer phase of processing, take the output from the mapper phase and process the data to create the final output, which is then stored in an output file within the Hadoop Distributed File System (HDFS).
Click here for the previous part. Reducer Phase: Record writers, a function in the reducer phase of processing, take the output from the mapper phase and process the data to create the final output, which is then stored in an output file within the Hadoop Distributed File System (HDFS). Shuffle and sort phases run concurrently, merging outputs as they are being retrieved. Note that, each job’s…
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