Are results returned as they become available, or all at once when a query completes?

60

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Why do I have to use refresh and invalidate metadata, what do they do?

60

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Why does my select statement fail?

41

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Does impala performance improve as it is deployed to more hosts in a cluster in much the same way that hadoop performance does?

164

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What is RDD in Apache Spark? How are they computed in Spark? what are the various ways in which it can create?

316

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What role does worker node play in Apache Spark Cluster? And what is the need to register a worker node with the driver program?

344

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What is SparkSession in Apache Spark? Why is it needed?

377

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What is the task of Spark Engine

324

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What is the user of sparkContext?

309

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How is the processing of streaming data achieved in Apache Spark? Explain.

284

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Can you do real-time processing with Spark SQL?

317

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Discuss the role of Spark driver in Spark application?

283

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What are the features of RDD, that makes RDD an important abstraction of Spark?

276

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What is Apache Spark? What is the reason behind the evolution of this framework?

275

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What are accumulators in Apache Spark?

318

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