Introduction to Hadoop Data Processing Applications
Introduction to Hadoop data processing applications, An open-source software framework called Apache Hadoop is used to create data processing applications that run in a distributed computing environment.
Large data sets dispersed over clusters of commodity machines are used to run applications created using the HADOOP framework.
Computers of this type are inexpensive and generally accessible. These are primarily helpful for getting more processing power at a reasonable price.
Data in Hadoop is stored on a distributed file system known as a Hadoop Distributed File system, which is similar to the local file system of a personal computer.
Computational logic is transmitted to cluster nodes (servers) that store data in the processing model, which is based on the “Data Locality” idea.
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Nothing more than a compiled version of a program written in a high-level language like Java makes up this computational logic. Such a program works with Hadoop HDFS data.
The below diagram shows various components in the Hadoop ecosystem-
Apache Hadoop is divided into two smaller projects:
MapReduce
MapReduce is a computational paradigm and programming framework used to create applications that run on Hadoop.
On huge clusters of computing nodes, these MapReduce applications are able to process enormous amounts of data in parallel.
HDFS (Hadoop Distributed File System)
The storage component of Hadoop applications is taken care of by HDFS (Hadoop Distributed File System).
Applications using MapReduce use the HDFS for their data. In a cluster of compute nodes, HDFS distributes data blocks in the form of numerous replicas.
This distribution makes computations dependable and incredibly quick.
Although MapReduce and its distributed file system, HDFS, are what Hadoop is best known for, the term is also used to refer to a group of related projects that fall under the categories of distributed computing and large-scale data processing.
Additionally, Apache is home to the Hadoop-related projects Hive, HBase, Mahout, Sqoop, Flume, and ZooKeeper.
MapReduce and HDFS techniques are used in Hadoop’s Master-Slave Architecture for data storage and distributed data processing.
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NameNode:
Every file and directory that was utilised in the namespace was represented by a NameNode.
DataNode:
You can interact with the blocks and manage the state of an HDFS node with the aid of DataNode.
MasterNode:
You can use Hadoop MapReduce to process data in parallel thanks to the master node.
Slave node:
The additional servers in the Hadoop cluster known as slave nodes allow you to store data and perform sophisticated calculations.
Additionally, a Task Tracker and a DataNode are included with every slave node. You can then synchronize the processes with the NameNode and the Job Tracker, respectively, using this.
In Hadoop, master or slave systems can be installed locally or in the cloud.
Features Of ‘Hadoop’
Suitable for Big Data Analysis
Big Data analysis is best performed on HADOOP clusters because big data is typically scattered and unstructured in nature.
Less network bandwidth is used since processing logic, rather than real data, is sent to the computing nodes.
This idea known as the data localization concept—helps Hadoop-based applications run more effectively.
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Scalability
By simply adding more cluster nodes, HADOOP clusters can be easily scaled to any size, facilitating the expansion of Big Data.
Additionally, scaling does not call for changes to application logic.
Fault Tolerance
The HADOOP ecosystem provides a feature that allows input data to be replicated to other cluster nodes.
In this manner, data processing can continue in the case of a cluster node failure by accessing data saved on an additional cluster node.
Network Topology In Hadoop
When the size of the Hadoop cluster increases, the topology (Network Arrangement) of the network has an impact on the performance of the Hadoop cluster.
In addition to performance, one must be concerned about high availability and failure handling. Network topology is utilized by Hadoop cluster construction to accomplish this.
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Features, Components, Cluster, and Topology of Hadoop
Network bandwidth is typically a crucial element to take into account when creating any network.
Due to the difficulty of measuring bandwidth, a network in Hadoop is represented as a tree, and the number of hops between tree nodes is seen to be a crucial element in the development of a Hadoop cluster.
In this case, the separation between two nodes equals the sum of their separation from their nearest common ancestor.
A data center, a rack, and the node that actually does jobs make up a Hadoop cluster. Data centers in this case are made up of racks and racks are made up of nodes.
Depending on where the processes are located, different amounts of network bandwidth are available to them.
In other words, the bandwidth we have available decreases as we go away from-
tasks running on the same node
several nodes on the same rack
Nodes in a single data center’s several racks
Nodes located in several data centers
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