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What is Hadoop cluster ?

 Hadoop Cluster:

A Hadoop cluster is a specially designed cluster of nodes that are used in the world of Web. It stores and analyses a large amount of unstructured data and in a distributing computer environment. These are the Hadoop open sources of the cluster that make the processing software at low-cost commodity computer.

These clusters enhance the speed of data analysis. Hadoop is the main open source framework that supports the processing of a large amount of data in distributing computer. While Hadoop cluster is a chain of computers that work together as a single computer.

Hadoop cluster ranges from a few to thousands of nodes. It is a master-slave relationship.  Hadoop cluster consists of three types of nodes: master node, worker node, and client node.

Master Nodes:

These nodes store data in Hadoop’s distributed computer system. Here the name node is in coordination with data storage function, JobTracker coordinates the parallel processing of data.it uses MapReduce. Name node oversees the Datanode.

Work node:

These make the major portion of the operating machine and stores data. Each work node runs the DataNode and TaskTracker and receives instructions from master nodes. Majority nodes in the cluster are work nodes that store the data.

Client nodes:

These nodes load data into the cluster, submit MapReduce job and gives instructions how the data will be processed. Client nodes then view the results when processing is finished.

Hadoop Cluster
Hadoop Cluster

Hadoop Cluster Architecture:

In the architecture of Hadoop’ cluster, we have a rank server as shown in Yahoo’s Hadoop cluster. This rank server is connected to a number of ranks. Every rank has a switch. This switch is connected to another switch that is connected to the switch of each and every rank and in this way it forms a cluster.

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Each rank is connected to the switch by cables. There are 8 core switches globally. Most of the servers act as the Slave nodes. Some machines here act as the Master node that consists of different configuration. The anatomy of cluster consists of Name nodes, Yarn Resource Manager, Data nodes, Yarn nodes. You need CSID to operate Hadoop cluster.

Hadoop clusters run their own files. A high-availability cluster uses both primary and secondary Name nodes. Similarly, a medium to large level Hadoop cluster is built with two or three architecture built in along with the rack-mounted server. Each rank server is interconnected.

The real example of Hadoop cluster Is Yahoo.

Typical flow work of Hadoop’s cluster:

We enter the data into the cluster. (HDFS).

Next data is analyzed. (MapReduce).

The result comes that is stored in the cluster. (HDFS).

Read the result from HDFS.

Cluster file system and description:

User:

This is the most heavily used cluster. It is very important to make sure that the file is responding. In cluster job, we have a user for cluster job organization.

Data:

It is the file system for storing large data set. Data is for files that are written once and read multiple times.

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Work:

It is to record the work or output from the cluster job. If there is a large amount of output space will be signed in work.

Projects:

It is basically used for organizing group collaboration.

Scratch:

This is the only file system that is without backup. Here the data is stored temporally just for processing in cluster jobs.

Library:

The library is for the researcher who wants to just copy the data on each node.

Tmp:

Here the free local space is accessible. It writes the output of cluster jobs to the local disk.

File Transfer:

For the transfer of files, we have a proper file transfer system.  You can transfer data by using cluster file system SCP (window client in WinSCP).

Example: if you use SMB mount under OSX.

smb://transfer.acf.ku.edu/work.

The next step of this is Job submission.

Job Submission:

It has some queues that are followed in order to submit the job.

Queues:

There are 5 queues.

Default:

This queue is used when the queue is not specified. This has a 1-week limit. The job here has 3 days limits till specified.

Long:

The long queue has a minimum limit of 1 week. It depends on the user to set the duration of time for job completion.

GPU:

The GPU queue is the access to cluster nodes having GPU’s. We require an OpenCL application support to make use of GPU computing resources.

Interactive:

We use the interactive queue for graphical interfaces. This is used for testing, debugging and profiling cluster jobs. The interactive queue has a limit wall time limit of one day.

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Benefits of Hadoop cluster:

As we all are familiar that all the organizations are making progress and they possess a lot of data which they are unable to handle at a time. So Hadoop cluster is the best solution to this problem in this modern world. But this also has some limitations.

One of the major benefits of Hadoop cluster is that it is best suitable for analyzing a large amount of data. It works by breaking the large bits of data into smaller ones.  Each smaller piece is then assigned to a cluster node.

Each piece of data is handled separately. Cluster’s parallel processing capacity help in enhancing the speed of analyzing the data. The third benefit of Hadoop cluster is, it is cheap in cost. So in handling the wide range of data Hadoop cluster proves to be a cost-effective solution.

The reason why it is cheap in cost is it is open source software. One of the biggest benefits of Hadoop’s cluster is that the data is saved here without any failure. As the data is entered into this software it is copied on all the nodes. So if one copy of the data is failed we have the other copy. It fulfills the challenge of data security.

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