Why MapReduce uses the key-value pair to process the data?

594

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What is Distributed Cache in the MapReduce Framework?

589

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How to create a custom key and custom value in MapReduce Job?

650

---

Is reduce-only job possible in Hadoop MapReduce?

658

---

How to optimize MapReduce Job?

623

---

In MapReduce how to change the name of the output file from part-r-00000?

609

---

In MapReduce Data Flow, when Combiner is called?

610

---

Differentiate Reducer and Combiner in Hadoop MapReduce?

639

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What is the key- value pair in MapReduce?

731

---

A number of combiners can be changed or not in MapReduce?

603

---

How to write a custom partitioner for a Hadoop MapReduce job?

610

---

What is the need of MapReduce in Hadoop?

601

---

What does a 'MapReduce Partitioner' do?

645

---

What is the difference between Reducer and Combiner in Hadoop MapReduce?

632

---

What is Data Locality in Hadoop?

618

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