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 is data pipeline in spark?

307

What are the port numbers of namenode, job tracker and task tracker?

753

In case of embedded Hive, can the same metastore be used by multiple users?

844

What is Hadoop serialization?

748

What is rdd map?

339

How does spark work with python?

315

How to create index statement in apache tajo?

What is difference between scala and spark?

331

What is the purpose of dfsadmin tool?

1297

What do you understand by worker node?

293

What is map in apache spark?

287

Explain the process to trigger automatic clean-up in Spark to manage accumulated metadata.

325

How does a client read/write data in HDFS?

What is ttl (time to live) in hbase?

192

When does impala hold on to or return memory?

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