Commodity Hardware
Commodity hardware basically means the PCs which is used to actually make up the cluster. Here commodity hardware essentially means it’s not gone be a cheap piece of machine. It means that when you are actually procuring the machine to build up your Hadoop cluster the hardware need not be confined or tied up to a single vendor meaning you can actually source different component of your PCs from different vendors and still actually build your systems and it easy to maintain and easy to procure and not tied up to single vendor. That’s what actually is meant by commodity hardware.
Cluster
Cluster or a grid is basically an interconnected system in a network and node here refers to a single piece of computer or single instance of computer.A distributed system is basically a cluster which is made up of multiple nodes and each of them are going to be connected by means of the network equipment which can be either your Ethernet cable or it can be fiber optic cables or it can also be WI-Fi, but typically in the industry is going to be high speed Ethernet cables all it's going to be fiber optic cable so this is what distributed system actually means basically a cluster of interconnected machines which can communicate over network.
Nice and concise
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