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Explain The Reducer's Sort Phase? |
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Answer» The framework GROUPS Reducer inputs by keys (since different mappers may have OUTPUT the same key) in this stage. The shuffle and SORT phases occur simultaneously; while map-outputs are being FETCHED they are merged (It is similar to merge-sort). The framework groups Reducer inputs by keys (since different mappers may have output the same key) in this stage. The shuffle and sort phases occur simultaneously; while map-outputs are being fetched they are merged (It is similar to merge-sort). |
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