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How do you create immutable object in Java?

May 12, 2019 admin Leave a comment

Most frequently asked interview question, when you say you have very good knowledge in Java. Below are similar questions: Can…

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How do you optimize a Spark job?

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What are the techniques to optimize a Spark job? This is a super important question for a Big data developer…

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What is the difference between Map and FlatMap in spark?

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One of the most common interview questions in big data developer interviews. I was asked this question in almost all…

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What is DAG scheduler in Spark?

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DAG – Directed Acyclic Graph A DAG comprises of edges and vertices, in which edges represent rdds and  vertices represent…

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What is RDD in Spark?

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Why RDD is immutable? What is the need of RDD in spark?   RDD – Resilient Distributed Dataset What is…

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What is the need of large block size in Hadoop?

May 11, 2019 admin 1 Comment

Why the block size is large in Hadoop? What is the use of having large block size in Hadoop?  …

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Posted in: Hadoop

What do you know about ORC file format?

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What is ORC file format? How ORC is better than RC file format?   ORC stands for Optimized Record Columnar…

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What is Avro file in Spark/Hadoop?

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Tell me something about Avro file format. What do you know about Avro files?   These are the common question…

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What is Sequence file in Spark/Hadoop?

May 10, 2019 admin Leave a comment

You may have come across questions like below during any of your spark interview. So to get full knowledge on…

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Is Java needed for Big Data/Spark interview?

May 8, 2019 admin Leave a comment

Many of us might be thinking is really Java required for a Big Data/Spark/Data engineer interview? If yes, what all…

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