Explain catalyst query optimizer in Apache Spark?

327

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What are the various modes in which Spark runs on YARN? (Local vs Client vs Cluster Mode)

289

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Apache Spark is a good fit for which type of machine learning techniques?

298

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Is it possible to run Apache Spark on Apache Mesos?

307

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What are the different levels of persistence in Spark?

348

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What is the default level of parallelism in apache spark?

411

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What is Directed Acyclic Graph in Apache Spark?

421

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What according to you is a common mistake apache spark developers make when using spark ?

286

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Name some internal daemons used in spark?

379

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Name the two types of shared variable available in Apache Spark?

312

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Explain distnct(),union(),intersection() and substract() transformation in Spark?

337

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Explain Accumulator in Spark?

467

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What is Speculative Execution in Apache Spark?

304

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Name three data source available in SparkSQL

319

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Is it possible to use Apache Spark for accessing and analyzing data stored in Cassandra databases?

315

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