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 ?

714

Explain the differences between a combiner and reducer

727

What is a TaskInstance?

712

What is the default input type in MapReduce?

719

Which directory does hadoop install to?

526

Why use hadoop?

473

What are the actions followed by hadoop?

507

What kind of hardware is best for hadoop?

466

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

481

How jobtracker assign tasks to the tasktracker?

466

What are the functionalities of jobtracer?

461

How does fault tolerance work in mapreduce?

691

What is a scarce system resource?

712

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

694

Write a short note on the disadvantages of mapreduce

649

Un-Answered Questions { Hadoop }

What is the no. Of threads created by impala?

Explain Zookeeper Queues?

Explain the concept of Tunable Consistency in Cassandra?

202

What is the best way to copy files between HDFS clusters?

719

Do we require two servers for the namenode and the datanodes?

558

Name the types of tunable consistency?

What is a block?

What are the basics of zookeeper api?

What is pig statistics?

567

Different Running Modes of Apache Spark

318

What is the main objective of creating Cassandra?

108

What is the use of exists command?

248

Tunable consistency is supported by Cassandra. Explain.

What is a sqoop metastore?

What does the command mapred.job.tracker do?

831

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