What is identity mapper and identity reducer?

693

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What is heartbeat in hdfs? Explain.

746

---

What is identity mapper and chain mapper?

720

---

Name job control options specified by mapreduce.

759

---

What is heartbeat in hdfs?

708

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What is difference between an input split and hdfs block?

708

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How do reducers communicate with each other?

733

---

How does inputsplit in mapreduce determines the record boundaries correctly?

691

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How will you submit extra files or data ( like jars, static files, etc. ) For a mapreduce job during runtime?

727

---

What main configuration parameters are specified in mapreduce?

722

---

How do you stop a running job gracefully?

652

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Is it necessary to write a mapreduce job in java?

670

---

What is shuffling and sorting in mapreduce?

695

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What is the function of mapreducer partitioner?

683

---

What is partitioner and its usage?

753

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