FUNDAMENTALS OF COMPUTER

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DATABASE FUNDAMENTALS

BASICS OF BIG DATA

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
The need for data replication can arise in various scenarios like ____
A
Replication Factor is changed
B
DataNode goes down
C
Data Blocks get corrupted
D
All of the mentioned
Explanation: 

Detailed explanation-1: -The need for data replication can arise in various scenarios like the Replication Factor is changed, a DataNode goes down, and when Data Blocks get corrupted, etc.

Detailed explanation-2: -Replication in HDFS increases the availability of Data at any point of time. If any node containing a block of data which is used for processing crashes, we can get the same block of data from another node this is because of replication.

Detailed explanation-3: -hdfs-site. xml configuration file is used to control the HDFS replication factor.

Detailed explanation-4: -Explanation: The Hadoop Distributed File System (HDFS) is designed to store very large data sets reliably, and to stream those data sets at high bandwidth to the user.

Detailed explanation-5: -Explanation: NameNode is aware of the files to which the blocks stored on it belong to. Get Free Certificate of Merit in Hadoop Now!

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