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What Is Combiner? |
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Answer» It’s a logical aggregation of key and value pair produced by mapper. It’s REDUCES a lot amount of duplicated data transfer between nodes, so eventually OPTIMIZE the job PERFORMANCE. The framework decides WHETHER COMBINER runs zero or multiple times. It’s not suitable where mean function occurs. It’s a logical aggregation of key and value pair produced by mapper. It’s reduces a lot amount of duplicated data transfer between nodes, so eventually optimize the job performance. The framework decides whether combiner runs zero or multiple times. It’s not suitable where mean function occurs. |
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