With a wide tracking range, and the point of an MMO being that you interact with other players, occasionally, but inevitably, you will have to compete for nodes. Once a node is harvested, it disappears for a few minutes then respawns, much like a mob.
This makes for a generally no apologies race to the node, first come first serve. When two players arrive at close to the same time, it can be down to who has the nicer tools and can thus finish the induction faster.
There are exceptions, however. If someone is fighting a mob at a node, there is a good chance they want the node. Running up and grabbing the node while they have aggro is a gross faux-pas. If someone is already at a node, in combat or not, it is usually best to just head for the next one.
You will get a head start on it, and the other person will likely skip that one and move to the next one. You can usually develop an unspoken agreement and divide the nodes with little interference.