How to add/delete a Node to the existing cluster?

255

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What is Mapper in Hadoop?

251

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What is Reducer in Hadoop?

250

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What are the most common InputFormats in Hadoop?

298

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Explain InputSplit in Hadoop?

235

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What is the purpose of RecordReader in hadoop?

229

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What is Combiner in Hadoop?

251

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If no custom partitioner is defined in Hadoop then how is data partitioned before it is sent to the reducer?

240

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Why aggregation cannot be done in Mapper?

302

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Explain map-only job?

276

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What is KeyValueTextInputFormat in Hadoop?

264

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What happen if number of reducer is set to 0 in Hadoop?

241

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What is TextInputFormat in Hadoop?

233

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What is purpose of RecordWriter in Hadoop?

285

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What are the most common OutputFormat in Hadoop?

298

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