Before Starting this make sure you have gone through the basic of BigData tutorial.

What is Hadoop?

Hadoop is an open-source software framework for storing data and running applications on clusters of commodity hardware. The Hadoop framework application works in an environment that provides distributed storage and computation across clusters of computers. It provides massive storage for any kind of data, enormous processing power and the ability to handle virtually limitless concurrent tasks or jobs. Hadoop is designed to scale up from single server to thousands of machines, each offering local computation and storage.

Hadoop has two major :-

  • Processing layer (MapReduce)
  • Storage layer (Hadoop Distributed File System).

What is MapReduce?

MapReduce is the processing layer in Hadoop. It is a software framework for writing an application that performs distributed processing. MapReduce is a programming model and an associated implementation for processing and generating big data sets with a parallel, distributed algorithm on a cluster.
We will learn more about MapReduce later on this tutorial.


Hadoop Distributed File System

HDFS is the world’s most reliable storage system. HDFS is a File system of Hadoop designed for storing very large files running on a cluster of commodity hardware. It is designed on the principle of storage of less number of large files rather than the huge number of small files. Hadoop HDFS provides a fault-tolerant storage layer for Hadoop and its other components. HDFS Replication of data helps us to attain this feature. It stores data reliably, even in the case of hardware failure. It provides high throughput access to application data by providing the data access in parallel.

Apart from the above-mentioned two core components, Hadoop framework also includes the following two modules −

  • Hadoop Common − These are Java libraries and utilities required by other Hadoop modules.
  • Hadoop YARN − This is a framework for job scheduling and cluster resource management.


How Does Hadoop Works ?



You can tie together many commodity computers with single-CPU, as a single functional distributed system and practically, the clustered machines can read the dataset in parallel and provide a much higher throughput. Moreover, it is cheaper than one high-end server. So this is the first motivational factor behind using Hadoop that it runs across clustered and low-cost machines.

Hadoop runs code across a cluster of computers. This process includes the following core tasks that Hadoop performs −

  • Data is initially divided into directories and files. Files are divided into uniform sized blocks of 128M and 64M (preferably 128M).
  • These files are then distributed across various cluster nodes for further processing.
  • HDFS, being on top of the local file system, supervises the processing.
  • Blocks are replicated for handling hardware failure.
  • Checking that the code was executed successfully.
  • Performing the sort that takes place between the map and reduce stages.
  • Sending the sorted data to a certain computer.
  • Writing the debugging logs for each job.


Advantages of Hadoop

  • Scalable: Hadoop is a highly scalable storage platform because it can store and distribute very large data sets across hundreds of inexpensive servers that operate in parallel.
  • Cost-effective: The problem with traditional relational database management systems is that it is extremely cost prohibitive to scale to such a degree in order to process such massive volumes of data. In an effort to reduce costs, many companies in the past would have had to down-sample data and classify it based on certain assumptions as to which data was the most valuable.
  • Flexible: Hadoop enables businesses to easily access new data sources and tap into different types of data (both structured and unstructured) to generate value from that data. This means businesses can use Hadoop to derive valuable business insights from data sources such as social media, email conversations.
  • Fast: Hadoop’s unique storage method is based on a distributed file system that basically ‘maps’ data wherever it is located on a cluster. The tools for data processing are often on the same servers where the data is located, resulting in much faster data processing. If you’re dealing with large volumes of unstructured data, Hadoop is able to efficiently process terabytes of data in just minutes, and petabytes in hours.
  • Resilient to failure:A key advantage of using Hadoop is its fault tolerance. When data is sent to an individual node, that data is also replicated to other nodes in the cluster, which means that in the event of failure, there is another copy available for use.



Lets know about the hdfs architecture which will give you a complete picture of the Hadoop Distributed File System. There is a single NameNode that stores metadata, and there are multiple DataNodes that do actual storage work.
Nodes are arranged in racks, and replicas of data blocks are stored on different racks in the cluster to provide fault tolerance. NameNode stores metadata, and DataNode stores actual data. The client interacts with NameNode for performing any tasks, as NameNode is the centerpiece in the cluster. There are several DataNodes in the cluster which store HDFS data in the local disk.
DataNode sends a heartbeat message to NameNode periodically to indicate that it is alive. Also, it replicates data to other DataNode as per the replication factor.

Hadoop Distributed File System follows the master-slave architecture. Each cluster comprises a single master node and multiple slave nodes.
Internally the files get divided into one or more blocks, and each block is stored on different slave machines depending on the replication factor (which you will see later in this article).The master node stores and manages the file system namespace, that is information about blocks of files like block locations, permissions, etc. The slave nodes store data blocks of files.




HDFS has a master/slave architecture. An HDFS cluster consists of a single NameNode,a master server that manages the file system namespace and regulates access to files by clients. In addition, there are a number of DataNodes, usually one per node in the cluster,which manage storage attached to the nodes that they run on. HDFS exposes a file system namespace and allows user data to be stored in files. Internally, a file is split into one or more blocks and these blocks are stored in a set of DataNodes. The NameNode executes file system namespace operations like opening, closing, and renaming files and directories. It
also determines the mapping of blocks to DataNodes. The DataNodes are responsible for serving read and write requests from the file system’s clients. The DataNodes also perform block creation, deletion, and replication upon instruction from the NameNode.



Generally the user data is stored in the files of HDFS. The file in a file system will be divided into one or more segments and/or stored in individual data nodes. These file segments are called as blocks. In other words, the minimum amount of data that HDFS can read or write is called a Block. The default block size is 64MB, but it can be increased as per the need to change in HDFS configuration.



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