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 ?

673

Explain the differences between a combiner and reducer

665

What is a TaskInstance?

671

What is the default input type in MapReduce?

669

Which directory does hadoop install to?

491

Why use hadoop?

443

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?

418

What are the functionalities of jobtracer?

410

How does fault tolerance work in mapreduce?

630

What is a scarce system resource?

660

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

639

Write a short note on the disadvantages of mapreduce

600

Un-Answered Questions { Hadoop }

What is flatmap in apache spark?

327

What is the role of the offset.

514

Define the run-time architecture of Spark?

286

Do we need hadoop for spark?

297

How ordering in hdfs is finished?

428

What happens when the node running the map task fails before the map output has been sent to the reducer?

655

Why use hadoop?

443

How HDFS helps NameNode in scaling in Hadoop?

What is bookkeeper?

What is the difference between client mode and cluster mode in spark?

322

what are the steps involved in decommissioning removing

1026

What is flatten in pig?

625

What is spark lineage?

302

What are different logging levels in cassandra?

What does rack awareness mean?

414

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