DATABASE FUNDAMENTALS
BASICS OF BIG DATA
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Data Node
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NameNode
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Data block
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Replication
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Detailed explanation-1: -A NameNode serves as the master and there is only one NameNode per cluster.
Detailed explanation-2: -NameNode is used when the Primary NameNode goes down. Answer : Standby.
Detailed explanation-3: -Namenode is the background process that runs on the master node on the Hadoop. There is only one namenode in a cluster.It stores the metadata(data about data) about data stored on the slave nodes such address of the Blocks, number of blocks stored, directory structure of any node etc.
Detailed explanation-4: -Master nodes are responsible for storing data in HDFS and overseeing key operations, such as running parallel computations on the data using MapReduce. The worker nodes comprise most of the virtual machines in a Hadoop cluster, and perform the job of storing the data and running computations.
Detailed explanation-5: -The Master nodes oversee the two key functional pieces that make up Hadoop: storing lots of data (HDFS), and running parallel computations on all that data (Map Reduce).