How often DataNode send heartbeat to NameNode in Hadoop?

275

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What is Mapper? How can we compress Mapper output in Hadoop?

242

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What is Rack Awareness? What is its need in Hadoop?

268

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What is Erasure Coding in Hadoop?

231

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Why do we need Hadoop Archives? How is it created?

256

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What is Slot in Hadoop v1? Why was it removed from Hadoop v2?

251

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What is CAP Theorem? What aspects does Hadoop support from this theorem?

229

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Why do we need Hadoop?

238

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What are the core components of Hadoop?

235

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What are the Features of Hadoop?

241

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Compare Hadoop and RDBMS?

235

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What are the modes in which Hadoop run?

237

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What are the features of Standalone (local) mode?

314

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What are the features of Pseudo mode?

230

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What are the features of Fully-Distributed mode?

243

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