Can you tell us how many daemon processes run on a hadoop system?

595

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Difference between mapreduce and spark

687

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What is identity mapper and identity reducer?

644

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What is heartbeat in hdfs? Explain.

681

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What is identity mapper and chain mapper?

669

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Name job control options specified by mapreduce.

708

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What is heartbeat in hdfs?

646

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What is difference between an input split and hdfs block?

657

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How do reducers communicate with each other?

667

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How does inputsplit in mapreduce determines the record boundaries correctly?

648

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

657

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What main configuration parameters are specified in mapreduce?

677

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How do you stop a running job gracefully?

607

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Is it necessary to write a mapreduce job in java?

627

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What is shuffling and sorting in mapreduce?

642

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