Pros - A ray of light in a situation where there are almost no Hadoop introductory lectures in Korean - You can create a MapReduce application including Wordcount through the MapReduce tutorial Cons - There are some awkward parts in Korean. It sometimes merges with English and there are also places where the voices seem to have been cut and spliced together. - You can leave out the introductions in the beginning and end..^^ Conclusion - There is nothing to criticize about the content, but I wish the overall composition and flow were a bit cleaner. I wrote down the cons, but since the lecture has many more advantages, I will give it 5 points without hesitation. There are many steady-selling Hadoop lectures on lecture sites like Udemy.. I am glad that there is a Korean Hadoop introductory lecture. As Cho mentioned, I am also looking forward to the Spark lecture. Thank you for the great lecture :)