Hello Everyone, I am preparing for hadoop interview and I want to know how will I restart NameNode or all the Hadoop daemons? Can anyone elaborate me this process how can I do this ..read more

They need to understand the functionalities of the storage and processing layers of Hadoop. Also, Hadoop developers have to access some of the advanced features in Hadoop via Java API. All these tasks require a basic knowledge of core Java programming. Knowledge of SQL will also be helpful ..read more

Hello All, I am preparing important topics of Hadoop for my upcoming interview and I want to know the difference between Hadoop 2 and Hadoop 3? Can anyone which one is fitted in GPU Hardware Usage between Hadoop 2 and Hadoop 3 ..read more

A spreadsheet with all the Big Data, Data Analytics and Data Science topics has been shared with all contributors. If you are a contributor, you should have edit access to the topics spreadsheet. You can choose one of the topics or add a relevant topic of your choice to the spreadsheet. If you do not have access, please fill the contact form and request for contributor level access. Eligibility for articles to be published: 1. Articles should be at least 2000 words and should be written in your own words based on your knowledge and/or experience 2. Articles should be original and not have cont ..read more

How can I start blogging on https://www.mindsmapped.com/category/big-data-hadoop/ Step1: Anybody can create a blogging account by registering for an account on wwww.mindsmapped.com. You will be assigned a subscriber account by default which does not allow users to post articles on the website. Step 2: You will have to request for a blogger account by filling the contact us form on https://www.mindsmapped.com/contact-us/ Step 3: Once your account is upgraded as a Contributor account, you can post your articles on the website. Articles will not be published directly but will be added to the revi ..read more

According to me there is no real pre-requisite to learn Hadoop. Read this article you might have a good idea on the pre-requisite to learn Hadoop https://www.mindsmapped.com/big-data-hadoop/what-are-the-pre-requisites-for-big-data-hadoop ..read more

I’m a newbie and I happened to know that Hadoop is one of the basic requirements to get a job. I wanted to know what are the basic knowledge or pre-requisite to learn Hadoop ..read more

MapReduce has 2 key components: Job Tracker: Coordinates all the jobs run on the system by scheduling tasks Keeps a record of overall progress of each job If a job fails, reschedules the job on a different tasktracker Task Tracker: Slave daemon which accepts tasks to be run a block of data Sends progress reports as heart beat signals to the Job tracker at regular intervals ..read more

What are MapReduce Components ..read more

Hive is is used as an interface or convenience for making data query stored in HDFS. MySQL is used for operations which requires many reads and writes ..read more