what is the purpose of using hadoop for big data analytics?

575

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what do you mean by data processing?

540

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Mention what is the hadoop mapreduce apis contract for a key and value class?

735

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Explain what combiners are and when you should use a combiner in a mapreduce job?

670

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What is the function of mapreduce partitioner?

702

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What combiners are and when you should use a combiner in a mapreduce job?

661

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Explain what is “map” and what is "reducer" in hadoop?

707

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Explain what does the conf.setmapper class do?

672

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Explain what are the basic parameters of a mapper?

869

---

Mention what is the next step after mapper or maptask?

700

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Explain what is shuffling in mapreduce?

677

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Explain what is distributed cache in mapreduce framework?

677

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Mention what are the main configuration parameters that user need to specify to run mapreduce job?

787

---

Explain what is the function of mapreduce partitioner?

688

---

Explain what is heartbeat in hdfs?

43

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