Why can aggregation not be done in Mapper in MapReduce?

654

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

734

---

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

655

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

727

---

Explain slot in Hadoop Map-Reduce v1?

738

---

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

700

---

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

721

---

What are the main configuration parameters in a MapReduce program?

685

---

What do you mean by shuffling and sorting in MapReduce?

762

---

What is Combiner in MapReduce?

698

---

Where sorting is done in Hadoop MapReduce Job?

692

---

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

723

---

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

703

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

877

---

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

768

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