It took 2 days. Since it was in lab format, it progressed quickly, and it was difficult because the namenode did not start (I think it was because of a mistake somewhere) Later, I saw that the trouble shoot guide section organized the startup procedure script and log viewing section. If I had seen this, I would have recovered from the mistake a bit faster ㅜㅜ For those who are going to do it, it would be better to read it once and follow it rather than just following along~ Instructor. Thank you for the great lecture every time~

Hello Jason.King, Thank you for taking my lecture diligently :) Sometimes, it will be helpful to experience bugs or troubleshooting yourself, think about them, and review them, so I think this experience will be of great help in the future. If you build a large open source yourself, you will be able to build a cluster, so if another open source comes out, you will be able to build it well in a short time. Fighting in the future.