What is identity mapper and identity reducer?

642

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What is heartbeat in hdfs? Explain.

676

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What is identity mapper and chain mapper?

665

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Name job control options specified by mapreduce.

704

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What is heartbeat in hdfs?

642

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What is difference between an input split and hdfs block?

653

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How do reducers communicate with each other?

663

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How does inputsplit in mapreduce determines the record boundaries correctly?

644

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

652

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What main configuration parameters are specified in mapreduce?

668

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How do you stop a running job gracefully?

597

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Is it necessary to write a mapreduce job in java?

621

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What is shuffling and sorting in mapreduce?

640

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What is the function of mapreducer partitioner?

612

---

What is partitioner and its usage?

682

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