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Explain Hive architecture.

April 12, 2020 admin Leave a comment

Bigdata developers always have to have some knowledge about internal working of all the components. That’s where we get to…

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Posted in: Hive, Spark Filed under: Hive

How to create a dataframe with custom schema in Spark?

March 30, 2020 admin 1 Comment

How to create a dataframe using a custom schema in Spark? This is one of the most common interview questions.…

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Posted in: Spark, Spark SQL

ROWID vs ROWNUM (or) What is the difference between ROWID and ROWNUM?

March 8, 2020 admin Leave a comment

This post will explain the difference between the SQL functions rownum and rowid.   ROWID : 1). ROWID is a…

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Posted in: Uncategorized

How to write word count program in Hive? (Or) Write word count program in Hive?

November 19, 2019 admin 11 Comments

In most of your interviews you might have came across the question to write word count program in MapReduce or…

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Posted in: Uncategorized

What is Monad in Scala?

July 21, 2019 admin 2 Comments

What is Scala Monad? Monad is neither a data type nor class/trait. Monad is a concept. There are lot ways…

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Posted in: Scala, Spark Filed under: Monad in Scala, Scala Monad

Slowly Changing Dimensions in Hive|Hive Slowly Changing Dimensions

July 13, 2019 admin Leave a comment

What is SCDs or Slowly Changing Dimensions? Slowly changing dimensions is a concept related to data warehousing. They track the…

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Posted in: Hive Filed under: Slowly Changing Dimensions

Why MapReduce task won’t run when we perform select * from table in Hive?

July 5, 2019 admin Leave a comment

While executing Hive queries you might have observed that the MapReduce task won’t start when you do perform a Select…

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Posted in: Hadoop, Hive, MapReduce

How to get file of equivalent size while importing data using sqoop?

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I don’t think this question has a particular answer that certainly gives us the required result. Because data is peculiar.…

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Posted in: Hadoop, Sqoop Filed under: Equivalent size files, Sqoop, Uneven Distribution

Currying Function in Scala

June 25, 2019 admin Leave a comment

Currying in Scala is a technique of transforming a function that takes multiple arguments into a function that takes only…

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Posted in: Uncategorized

Higher Order Functions in Scala

June 24, 2019 admin Leave a comment

Higher Order functions take other functions as parameters and return function as result, i.e., passing functions as parameters to other…

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Posted in: Uncategorized
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