Explain the core methods of the reducer?

482

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How to handle bad records during parsing?

431

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What is the use of context object?

441

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What happens if number of reducers are 0?

444

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What are the primary phases of the reducer?

433

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what is next step after mapper or maptask?

390

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What is a rack?

386

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Do we require two servers for the namenode and the datanodes?

491

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We have already sql then why nosql?

389

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What is difference between reducer and combiner?

526

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What do you understand by standalone (or local) mode?

393

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What type of data we should put in distributed cache? When to put the data in dc? How much volume we should put in?

411

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What is pseudo-distributed mode?

576

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When we send a data to a node, do we allow settling in time, before sending another data to that node?

448

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Can we write map reduce program in other than java programming language. How?

462

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