What makes Hadoop Fault tolerant?Hadoop interview question set 1/Apache Hadoop Interview Questions and Answers for Freshers & Experienced

What makes Hadoop Fault tolerant?

Hadoop is said to be highly fault tolerant. Hadoop achieves this feat through the process of replication. Data is replicated across multiple nodes in a Hadoop cluster. The data is associated with a replication factor, which indicates the number of copies of the data that are present across the various nodes in a Hadoop cluster. For example, if the replication factor is 3, the data will be present in three different nodes of the Hadoop cluster, where each node will contain one copy each. In this manner, if there is a failure in any one of the nodes, the data will not be lost, but can be recovered from one of the other nodes which contains copies or replicas of the data.

Hadoop 3.0, however, makes use of the method of Erasure Coding (EC). EC is implemented by means of Redundant Array of Inexpensive Disks (RAID) by striping, where logically sequential data is divided into smaller units and these smaller units are then stored as consecutive unts on different disks. Replication results in a storage overhead of 200% in case of a replication factor of 3 (which is the default replication factor). The use of EC in Hadoop improves storage efficiency when compared to replication, but still maintains the same level of fault tolerance.

Posted Date:- 2021-08-30 22:23:07

Write the command used to copy data from the local system onto HDFS?

Explain the usage of Context Object.

Whenever a client submits a hadoop job, who receives it?

What is a rack awareness and on what basis is data stored in a rack?

How can you skip the bad records in Hadoop?

What is the process to change the files at arbitrary locations in HDFS?

Where does Hive store the table data by default?

Explain what happens if during the PUT operation, HDFS block is assigned a replication factor 1 instead of the default value 3.

Explain about the process of inter cluster data copying.

What is the default replication factor?

What is commodity hardware?

What is DistCp?

Mention features of Apache sqoop.

What do you mean by SerDe in Hive? Explain.

Mention a business use case where you worked with the Hadoop Ecosystem

What is Big Data?

What is meant by over/under- replicated blocks in Hadoop?

Explain the difference between HBase and Hive.

Explain the three core methods of a reducer.

What are the Benefits of using zookeeper?

What is Apache ZooKeeper?

How can you restart the NameNode in Hadoop?

What makes Hadoop Fault tolerant?

How will you choose various file formats for storing and processing data using Apache Hadoop ?

What are the steps involved in deploying a big data solution?

What are the most commonly defined input formats in Hadoop?

What is the best hardware configuration to run Hadoop?

What are the main components of a Hadoop Application?

On what concept the Hadoop framework works?

List the YARN components.

What is Yarn?

What is Apache Pig?

What is an Apache Hive?

What is Hadoop MapReduce?

What is the port number for NameNode?

Explain how data is stored in a rack.

Compare HDFS with Network Attached Storage (NAS).

What is meant by a block and block scanner?

What is indexing? How is indexing done in HDFS?

Explain the difference between HDFS and regular FileSystem.

What is shuffling in MapReduce?

What are the Limitations of Hadoop 1.0 ?

Name some companies that use Hadoop.

What are some limitations of Hadoop?

What are the three modes in which Hadoop runs?

How big data analysis helps businesses increase their revenue? Give example.

What do the four V’s of Big Data denote?

Explain the Storage Unit In Hadoop (HDFS).

What are the challenges faced with Big Data, and why do we use Hadoop for Big Data?

What is Apache Hadoop?

R4R Team
R4R provides Apache Hadoop Freshers questions and answers (Apache Hadoop Interview Questions and Answers) .The questions on R4R.in website is done by expert team! Mock Tests and Practice Papers for prepare yourself.. Mock Tests, Practice Papers,Hadoop interview question set 1,Apache Hadoop Freshers & Experienced Interview Questions and Answers,Apache Hadoop Objetive choice questions and answers,Apache Hadoop Multiple choice questions and answers,Apache Hadoop objective, Apache Hadoop questions , Apache Hadoop answers,Apache Hadoop MCQs questions and answers Java, C ,C++, ASP, ASP.net C# ,Struts ,Questions & Answer, Struts2, Ajax, Hibernate, Swing ,JSP , Servlet, J2EE ,Core Java ,Stping, VC++, HTML, DHTML, JAVASCRIPT, VB ,CSS, interview ,questions, and answers, for,experienced, and fresher R4r provides Python,General knowledge(GK),Computer,PHP,SQL,Java,JSP,Android,CSS,Hibernate,Servlets,Spring etc Interview tips for Freshers and Experienced for Apache Hadoop fresher interview questions ,Apache Hadoop Experienced interview questions,Apache Hadoop fresher interview questions and answers ,Apache Hadoop Experienced interview questions and answers,tricky Apache Hadoop queries for interview pdf,complex Apache Hadoop for practice with answers,Apache Hadoop for practice with answers You can search job and get offer latters by studing r4r.in .learn in easy ways .