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

Apache Hadoop (394)
MapReduce (354)
Apache Hive (345)
Apache Pig (225)

Apache Ambari (93)
Apache HCatalog (34)
Apache HDFS Hadoop Distributed File System (214)
Apache Kafka (189)

Hadoop Interview Questions

Questions Answers Views Company eMail

what happens in textinformat ?

669

Explain the differences between a combiner and reducer

662

What is a TaskInstance?

669

What is the default input type in MapReduce?

666

Which directory does hadoop install to?

489

Why use hadoop?

440

What are the actions followed by hadoop?

466

What kind of hardware is best for hadoop?

418

Where are hadoop’s configuration files located and list them?

447

How jobtracker assign tasks to the tasktracker?

414

What are the functionalities of jobtracer?

410

How does fault tolerance work in mapreduce?

626

What is a scarce system resource?

654

With the help of two examples name the map and reduce function purpose

638

Write a short note on the disadvantages of mapreduce

600

Un-Answered Questions { Hadoop }

What is Hive ?

999

What are the similarities and differences between Apache Flume and Apache Kafka?

107

What happens when two users try to access to the same file in HDFS?

What does job conf class do?

670

What is shuffle spill in spark?

283

What are impala architecture components?

Give the sqoop command to see the content of the job named myjob?

What is the purpose of DataNode block scanner?

969

Can you explain sequence file in hadoop?

407

What are the steps involved in MapReduce framework?

983

What is the function of NodeManager?

907

What is the difference between TextinputFormat and KeyValueTextInputFormat class?

512

What are nodes and ephemeral nodes?

What is the use of binstorage?

572

What are the main methods of data transferring in hadoop sqoop?

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