How to add/delete a Node to the existing cluster?

573

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What is Mapper in Hadoop?

604

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What is Reducer in Hadoop?

599

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What are the most common InputFormats in Hadoop?

650

---

Explain InputSplit in Hadoop?

505

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What is the purpose of RecordReader in hadoop?

525

---

What is Combiner in Hadoop?

580

---

If no custom partitioner is defined in Hadoop then how is data partitioned before it is sent to the reducer?

507

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Why aggregation cannot be done in Mapper?

614

---

Explain map-only job?

562

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What is KeyValueTextInputFormat in Hadoop?

583

---

What happen if number of reducer is set to 0 in Hadoop?

532

---

What is TextInputFormat in Hadoop?

571

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What is purpose of RecordWriter in Hadoop?

547

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What are the most common OutputFormat in Hadoop?

586

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