I'm starting to learn Hadoop and I want to make a repository with MapReduce programs to train myself but I have a big doubt.
All the theory for the certification CCDH (which I want to pass in 2-3 months) it's for Hadoop 1.x and there is some information about Hadoop 2 (YARN) like in the last edition of Hadoop: The definitive guide. So my question is:
Should I install Hadoop 1.x and learn the basics to pass the exam or should I go for Hadoop 2 to learn the newest implementation? Can I install both in the same computer (ubuntu 14.10)?