I'm a brand-new (read: started 3 weeks ago) Ph.D. student in Computer Engineering at an R1 institution in the U.S. I was offered a position in a particular lab due to some prior experience I had on a topic of interest; my funding isn't tied to this particular lab though. The faculty member heading the lab offered me the chance to start early and get a head start on research this summer, which I gladly accepted.
As I said, I'm about 3 weeks in now, and I'm starting to get worried about the feasibility of the task they've assigned to me. Part of me wants to just chalk it up to my own inexperience and tell myself that it's nothing, but I had an unsettling experience with one of the other graduate students recently. Specifically, he told me that he had been originally assigned to work on the same task, and after some research he had concluded that it was infeasible at best (due to the sheer complexity of it) and a waste of time at worst (since even if it was completed, its performance would be terrible compared to existing applications). This grad student is getting ready to graduate with his M.S., so he's not brand-new like I am.
So my questions are: (1) do my concerns about the feasibility of the task have any substance (given my inexperience with large research projects) and (2) if they do, how do I approach my adviser/faculty member with them?