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

Hadoop Interview Questions

Questions Answers Views Company eMail

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 }

What do you mean by Schema Resolution?

What is Federation?

461

Explain leftOuterJoin() and rightOuterJoin() operation in Apache Spark?

403

how can we access the sub directories recursively?

849

Wherever (Different Directory) I run the hive query, it creates new metastore_db, please explain the reason for it?

781

Is there an api for implementing graphs in spark?

2046

Map reduce jobs are failing on a cluster that was just restarted. They worked before restart. What could be wrong?

645

What is reduce side join in mapreduce?

657

How to stop a partition form being queried?

1201

How can we have to see all the clusters that are available in ambari?

Explain the role of the offset?

569

What do masters consist of?

725

Explain about the different cluster managers in Apache Spark

351

What do you mean by ss table?

Does spark require hadoop?

303

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