Interview Questions

AJAX Interview Questions Android Interview Questions Angular 2 Interview Questions AngularJs Interview Questions Apache Presto Interview Questions Apache Tapestry Interview Questions Arduino Interview Questions ASP.NET MVC Interview Questions Aurelia Interview Questions AWS Interview Questions Blockchain Interview Questions Bootstrap Interview Questions C Interview Questions C Programming Coding Interview Questions C# Interview Questions C++ Interview Questions Cakephp Interview Questions Cassandra Interview Questions CherryPy Interview Questions Clojure Interview Questions Cobol Interview Questions CodeIgniter interview Questions CoffeeScript Interview Questions Cordova Interview Questions CouchDB interview questions CSS Buttons Interview Questions CSS Interview Questions D Programming Language Interview Questions Dart Programming Language Interview Questions Data structure & Algorithm Interview Questions DB2 Interview Questions DBMS Interview Questions Django Interview Questions Docker Interview Questions DOJO Interview Questions Drupal Interview Questions Electron Interview Questions Elixir Interview Questions Erlang Interview Questions ES6 Interview Questions and Answers Euphoria Interview Questions ExpressJS Interview Questions Ext Js Interview Questions F# Interview Questions Firebase Interview Questions Flask Interview Questions Flex Interview Questions Fortran Interview Questions Foundation Interview Questions Framework7 Interview Questions FuelPHP Framework Interview Questions Go Programming Language Interview Questions Google Maps Interview Questions Groovy interview Questions GWT Interview Questions Hadoop Interview Questions Haskell Interview Questions Highcharts Interview Questions HTML Interview Questions HTTP Interview Questions Ionic Interview Questions iOS Interview Questions IoT Interview Questions Java BeanUtils Interview Questions Java Collections Interview Questions Java Interview Questions Java JDBC Interview Questions Java Multithreading Interview Questions Java OOPS Interview Questions Java Programming Coding Interview Questions Java Swing Interview Questions JavaFX Interview Questions JavaScript Interview Questions JCL (Job Control Language) Interview Questions Joomla Interview Questions jQuery Interview Questions js Interview Questions JSF Interview Questions JSP Interview Questions KnockoutJS Interview Questions Koa Interview Questions Laravel Interview Questions Less Interview Questions LISP Interview Questions Magento Interview Questions MariaDB Interview Questions Material Design Lite Interview Questions Materialize CSS Framework Interview Questions MathML Interview Questions MATLAB Interview Questions Meteor Interview Questions MongoDB interview Questions Moo Tools Interview Questions MySQL Interview Questions NodeJS Interview Questions OpenStack Interview Questions Oracle DBA Interview Questions Pascal Interview Questions Perl interview questions Phalcon Framework Interview Questions PhantomJS Interview Questions PhoneGap Interview Questions Php Interview Questions PL/SQL Interview Questions PostgreSQL Interview Questions PouchDB Interview Questions Prototype Interview Questions Pure CSS Interview Questions Python Interview Questions R programming Language Interview Questions React Native Interview Questions ReactJS Interview Questions RequireJs Interview Questions RESTful Web Services Interview Questions RPA Interview Questions Ruby Interview Questions Ruby on Rails Interview Questions SAS Interview Questions SASS Interview Questions Scala Interview Questions Sencha Touch Interview Questions SEO Interview Questions Servlet Interview Questions SQL Interview Questions SQL Server Interview Questions SQLite Interview Questions Struts Interview Questions SVG Interview Questions Swift Interview Questions Symfony PHP Framework Interview Questions T-SQL(Transact-SQL) Interview Questions TurboGears Framework Interview Questions TypeScript Interview Questions UiPath Interview Questions VB Script Interview Questions VBA Interview Questions WCF Interview Questions Web icon Interview Questions Web Service Interview Questions Web2py Framework Interview Questions WebGL Interview Questions Website Development Interview Questions WordPress Interview Questions Xamarin Interview Questions XHTML Interview Questions XML Interview Questions XSL Interview Questions Yii PHP Framework Interview Questions Zend Framework Interview Questions

Top 15 Hadoop Interview Questions for 2022

1) What is Hadoop?

Hadoop is a framework which is used to store and process Big Data. It is a distributed computing platform and helps in analyzing Big Data.

2) What are the types of input formats defined in Hadoop?

There are three types of input formats:
  • TextInputFormat(By Default Input Format)
  • KeyValueInputFormat
  • SequenceFileInputFormat

3) What is JobTracker in Hadoop?

It is a service which is used to run MapReduce jobs on the cluster.

4) What is NameNode in Hadoop?

It is the node which is used to stores all the file location information in HDFS (Hadoop Distributed File System). It is also used to tracks the file data across the cluster or multiple machines.

5) What are the basic parameters of a Mapper?

There are two types of basic parameters are:
  • Text and IntWritable
  • LongWritable and Text

6) What are the types of configuration files in Hadoop?

There are three types configuration files are:
  • core-site.xml
  • hdfs-site.xml
  • mapred-site.xml

7) What are the core components of Flume?

The core components of Flume are:
  • Event
  • Source
  • Sink
  • Channel
  • Agent
  • Client

8) What does 'jps' command do?

It is used to check the Hadoop daemons are running or not. It shows all the Hadoop daemons that are running on the machine.

9) What are the basic differences between relational database and Hadoop?

Difference between relational database and HDFS are:
RDBMS Hadoop
It relies on the structured data and the schema In Hadoop, Any kind of data can be stored
Here, schema validation is done before loading the data Here, Hadoop follows the schema on read policy.
It is used for OLTP (Online Trasanctional Processing) system It is used for Data discovery

10) What are the different relational operations in “Pig Latin” you worked with?

Relational Operators are:
  • join
  • limit
  • group
  • filters
  • for each
  • order by
  • distinct

11) What is the default location where "Hive" stores table data?

Inside HDFS in /user/hive/warehouse

12) What are the components of Apache HBase?

Three major components are:
  • HMaster
  • ZooKeeper
  • Region Server

13) What are the components of Region Server?

Components of Region Server are:
  • WAL
  • HFile
  • MemStore
  • Block Cache

14) Name some companies that use Hadoop?

Companies that use Hadoop are:
  • Adobe
  • eBay
  • Facebook
  • Netflix
  • Amazon

15) What is the port number for NameNode, Task Tracker and Job Tracker?

Port number for:
  • NameNode is 50070
  • Task Tracker is 50060
  • Job Tracker is 50030



ADVERTISEMENT
ADVERTISEMENT