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When Used Reducer? |
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Answer» To combine multiple mapper’s output used reducer. Reducer has 3 PRIMARY phases sort, shuffle and REDUCE. It’s possible to process DATA without reducer, but used when the shuffle and sort is required. To combine multiple mapper’s output used reducer. Reducer has 3 primary phases sort, shuffle and reduce. It’s possible to process data without reducer, but used when the shuffle and sort is required. |
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