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Yes, you can enroll in as many courses as you want from Great Learning Academy. There is no limit to the number of courses you can enroll in at once, but since the courses offered by Great Learning Academy are free, we suggest you learn one by one to get the best out of the subject.

Great Learning Academy provides this Hadoop course for free online. The course is self-paced and helps you understand various topics that fall under the subject with solved problems and demonstrated examples. The course is carefully designed, keeping in mind to cater to both beginners and professionals, and is delivered by subject experts. Great Learning is a global ed-tech platform dedicated to developing competent professionals. Great Learning Academy is an initiative by Great Learning that offers in-demand free online courses to help people advance in their jobs. More than 5 million learners from 140 countries have benefited from Great Learning Academy's free online courses with certificates. It is a one-stop place for all of a learner's goals.

Enrolling in any of the Great Learning Academy’s courses is just one step process. Sign-up for the course, you are interested in learning through your E-mail ID and start learning them for free online.

Yes, once you enroll in the course, you will have lifetime access, where you can log in and learn whenever you want to. 

Hadoop is an open-source framework for processing, storing, and analyzing massive amounts of distributed unstructured data. It is created to scale up from one server to thousands of machines with a high degree of fault tolerance. Its goal is to scan large data set to produce results through distributing and highly scalable batch processing systems. 

While working with Pig or Hive Hadoop uses SQL because Hadoop Hive is to process to structure and semi-structured data in the form of SQL queries.

Hadoop is not an operating system, it is a collection of open-source software utilities which facilitate using a network of so many computers to solve problems consisting of a large amount of data and computation. But Hadoop is going to behave, look and feel like an OS for data centers running cloud applications. 

Hadoop distributed processing for large sets of data over the cluster of commodity servers and works on different machines at the same time. To process different kinds of data, the client provides data and programs to Hadoop. HDFS stores the data, while Mapreduce processes the data and Yarn, Split the task. 

Yes, you can enroll in this course and learn for free

After completion of this course, you will get a course certificate from Great Learning which you can share on your  Linkedin profile, on CVs, and other documents.