Hadoop Interview Questions, Answers for Freshers and Experienced asked in various Company Job Interviews

Hadoop Interview Questions

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How many default mappers in sqoop ?

Write a quert to import a file in sqoop?

What is Sqoop Import? Explain its purpose?

What is the default file format to import data using Apache Sqoop?

How can I import large objects (BLOB and CLOB objects) in Apache Sqoop?

How can you execute a free-form SQL query in Sqoop to import the rows in a sequential manner?

Does Apache Sqoop have a default database?

How will you list all the columns of a table using Apache Sqoop?

Name a few import control commands. How can Sqoop handle large objects?

How can we import data from particular row or column? What is the destination types allowed in Sqoop import command?

When to use –target-dir and when to use –warehouse-dir while importing data?

What is the significance of using –compress-codec parameter?

Can free-form SQL queries be used with Sqoop import command? If yes, then how can they be used?

What is the importance of eval tool?

How can you import only a subset of rows from a table?

Un-Answered Questions { Hadoop }

Explain the process for starting a kafka server?

493

How can we remove a znode?

What are the disadvantages of hadoop serialization?

did you maintain the hadoop cluster in-house or used hadoop in the cloud?

977

How do you list all databases whose name starts with p?

640

How do I start a spark master?

277

What is Data Locality in Hadoop?

624

When do you have to avoid secondary indexes?

What are ‘maps’ and ‘reduces’?

668

Explain various level of persistence in Apache Spark?

290

Why does my select statement fail?

List some use cases where classification machine learning algorithms can be used.

428

What are the ways in which Apache Spark handles accumulated Metadata?

345

How Spark uses Hadoop?

290

What is a commodity hardware? Does commodity hardware include RAM?

498

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