What is the use of context object?

466

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What happens if number of reducers are 0?

470

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What are the primary phases of the reducer?

459

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what is next step after mapper or maptask?

425

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What is a rack?

417

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

525

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We have already sql then why nosql?

418

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What is difference between reducer and combiner?

564

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

422

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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?

433

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What is pseudo-distributed mode?

600

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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?

480

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

492

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Are job tracker and task trackers present in separate machines?

462

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What is namenode?

482

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