What is Hadoop?

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What is Hadoop

What is Hadoop?

Five metrics of Hadoop are volume, variety, velocity, veracity, and value. Data is increasing rapidly, and it comes in a structured, unstructured and semi-structured format. Data is increasing at high speed and we should get some meaningful insight from the data. Data must have some value, but there are some inconsistencies and uncertainty present in the data. Traditional systems that store data is not able to store these rapidly increasing data due to storage space. The traditional system is not able to process data comes in complex data structure and it takes a huge amount of time to process the data. Hadoop would solve the issue of the traditional database system. Hadoop is a framework that processes a huge amount of data parallelly and stores it in a distributed environment. Hadoop has two components 1) HDFS (store data across a cluster) 2) MapReduce (process data parallelly). HDFS will store data in the form of different blocks. The default block size is 128MB.

Applications of Hadoop

The Applications of Hadoop are explained below:

Application of Hadoop

a. Website Tracking

Suppose you have created a website, want to know about visitors’ details. Hadoop will capture a massive amount of data about this. It will give information about the location of the visitor, which page visitor visited first and most, how much time spent on the website and on which page, how many times a visitor has visited page, what visitor like most about. This will provide predictive analysis of visitors’ interest, website performance will predict what would be users interest. Hadoop accepts data in multiple formats from multiple sources. Apache HIVE will be used to process millions of data.

b. Geographical Data

When we buy products from an e-commerce website. The website will track the location of the user, predict customer purchases using smartphones, tablets. Hadoop cluster will help to figure out business in geo-location. This will help the industries to show the business graph in each area (positive or negative).

c. Retail Industry

Retailers will use data of customers which is present in the structured and unstructured format, to understand, analyze the data. This will help a user to understand customer requirements and serve them with better benefits and improved services.

d. Financial Industry

Financial Industry and Financial companies will assess the financial risk, market value and build the model which will give customers and industry better results in terms of investment like the stock market, FD, etc. Understand the trading algorithm. Hadoop will run the build model.

e. Healthcare Industry

Hadoop can store large amounts of data. Medical data is present in an unstructured format. This will help the doctor for a better diagnosis. Hadoop will store a patient medical history of more than 1 year, will analyze symptoms of the disease.

f. Digital Marketing

We are in the era of the ’20s, every single person is connected digitally. Information is reached to the user over mobile phones or laptops and people get aware of every single detail about news, products, etc. Hadoop will store massively online generated data, store, analyze and provide the result to the digital marketing companies.

Features of Hadoop

Given below are the Features of Hadoop:

Features of Hadoop

1. Cost-effective: Hadoop does not require any specialized or effective hardware to implement it. It can be implemented on simple hardware which is known as community hardware.

2. The large cluster of nodes: A cluster can be made up of 100’s or 1000’s of nodes. The benefit of having a large cluster is, it offers more computing power and a huge storage system to the clients.

3. Parallel processing: Data can be processed simultaneously across all the clusters and this process will save a lot of time. The traditional system was not able to do this task.

4. Distributed data: Hadoop framework takes care of splitting and distributing the data across all the nodes within a cluster. It replicates data over all the clusters. The replication factor is 3.

5. Automatic failover management: Suppose if any of the nodes within a cluster fails, the Hadoop framework will replace the failure machine with a new machine. Replication settings of the old machine are shifted to the new machine automatically. Admin does not need to worry about it.

6. Data locality optimization: Suppose the programmer needs data of node from a database which is located at a different location, the programmer will send a byte of code to the database. It will save bandwidth and time.

7. Heterogeneous cluster: It has a different node supporting different machines with different versions. IBM machine is supporting Red hat Linux.

8. Scalability: Adding or removing nodes and adding or removing hardware components to or from the cluster. We can perform this task without disturbing cluster operation. RAM or Hard Drive can be added or remove from the cluster.

Advantages of Hadoop

The advantages of Hadoop are explained below:

Hadoop can handle large data volume and able to scale the data based on the requirement of the data. Now a day’s data is present in 1 to 100 tera-bytes.
It will scale a huge volume of data without having many challenges Let’s take an example of Facebook – millions of people are connecting, sharing thoughts, comments, etc. It can handle software and hardware failure smoothly.
If one system fails data will not be lost or no loss of information because the replication factor is 3, Data is copied 3 times and Hadoop will move data from one system to another. It can handle various types of data like structured, unstructured or semi-structured.
Structure data like a table (we can retrieve rows or columns value easily), unstructured data like videos, and photos and semi-structured data like a combination of structured and semi-structured.
The cost of implementing Hadoop with the bigdata project is low because companies purchase storage and processing services from cloud service providers because the cost of per-byte storage is low.
It provides flexibility while generating value from the data like structured and unstructured. We can derive valuable data from data sources like social media, entertainment channels, shopping websites.
Hadoop can process data with CSV files, XML files, etc. Data is processed parallelly in the distribution environment, we can map the data when it is located on the cluster. Server and data are located at the same location so processing of data is faster.
If we have a huge set of unstructured data, we can proceed terabytes of data within a minute. Developers can code for Hadoop using different programming languages like python, C, C++. It is an open-source technology. Source code is easily available online. If data gets increasing day by day, we can add nodes to the cluster. We don’t need to add more clusters. Every node performs its job by using its own resources.


Hadoop can perform large data calculations. To process this, Google has developed a Map-Reduce algorithm, Hadoop will run the algorithm. This will play a major role in statistical analysis, business intelligence, and ETL processing. Easy to use and less costly available. It can handle tera-byte of data, analyze it and provide value from data without any difficulties with no loss of information.

Recommended Articles

This is a guide to What is Hadoop?. Here we discuss the Application of Hadoop, and Features along with the Advantages. You can also go through our other suggested articles to learn more–

Clustering Methods
IoT Software
Hadoop FS Command-List
Advantages of Hadoop

The post What is Hadoop? appeared first on EDUCBA.

Read more: educba.com

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