Why can aggregation not be done in Mapper in MapReduce?

604

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How to submit extra files(jars, static files) for MapReduce job during runtime?

669

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How many numbers of reducers run in Map-Reduce Job?

608

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What is MapReduce? What are the syntax you use to run a MapReduce program?

663

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Explain slot in Hadoop Map-Reduce v1?

681

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What happen if the number of the reducer is 0 in MapReduce?

649

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What is the need of key-value pair to process the data in MapReduce?

665

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What are the main configuration parameters in a MapReduce program?

632

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What do you mean by shuffling and sorting in MapReduce?

693

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What is Combiner in MapReduce?

636

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Where sorting is done in Hadoop MapReduce Job?

648

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What are the configuration parameters in the 'MapReduce' program?

669

---

How many times combiner is called on a mapper node in Hadoop?

637

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Explain about the partitioning, shuffle and sort phase in MapReduce?

817

---

Does Partitioner run in its own JVM or shares with another process?

704

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