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Hadoop handles big data problems by dividing Large datasets into chunks and then store them into HDFS,
HDFS works in Master Slave fashion, where it stores blocks of data in a cluster of commodity hardware.
So a hadoop cluster contains Name node which resides on Master and Series of Data Nodes that resides in slaves machines and work parallely to get the work done.
Single Node Cluster is the one in which Name Node and Data Node reside onto a single Machine but in Distributed Cluster they can spread across multiple machines. -
Cluster is the connection of large number of (commodity) hardwares/systems.
Single node cluster (pseudo distributed mode) refers to a hardware working as both the master and slave. All daemons working on their own JVM.
Each hardware in the cluster is referred to as node( Master node – name nodeand slave nodes – data node
Fly refers to the ability to connect new systems to the cluster without any downtime. The clusters are connected through LAN(Local Area Network).
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What is cluster,single node cluster,node,fly etc.
Cluster:
Cluster means a group of Computers that are worked together as one system. In Hadoop, Cluster is mainly designed for storing a large amount of unstructured data in Distributed file systems on multiple computers.
Single node cluster:
Single Node in Hadoop is where all the daemons are running on a single machine. It will have one NameNode, DataNode, ResourceManager and NodeManager. The Single node cluster is used for studying and testing purposes.
Node:
Hadoop cluster has the group of Computers that are connected to one system to process the data in HDFS. Here, each single system/computer connected to the cluster is referred as the node.
Fly:
Allocating the resource/adding additional system in the Hadoop cluster to increase the Storage/Processing speed can be done “On the fly” without any downtime of the entire system.
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