Tutorial approach and structure
From two single-node clusters to a multi-node cluster – We will build a multi-node cluster using two Ubuntu boxes in this tutorial. In my humble opinion, the best way to do this for starters is to install, configure and test a “local” Hadoop setup for each of the two Ubuntu boxes, and in a second step to “merge” these two single-node clusters into one multi-node cluster in which one Ubuntu box will become the designated master (but also act as a slave with regard to data storage and processing), and the other box will become only a slave. It’s much easier to track down any problems you might encounter due to the reduced complexity of doing a single-node cluster setup first on each machine.
Let’s get started!
Configuring single-node clusters first
The tutorial approach outlined above means that you should read now my previous tutorial on how to setup up a Hadoop single-node cluster and follow the steps described there to build a single-node Hadoop cluster on each of the two Ubuntu boxes. It is recommended that you use the ‘‘same settings’’ (e.g., installation locations and paths) on both machines, or otherwise you might run into problems later when we will migrate the two machines to the final multi-node cluster setup.
Just keep in mind when setting up the single-node clusters that we will later connect and “merge” the two machines, so pick reasonable network settings etc. now for a smooth transition later.