This is from the Yahoo news story Yosemite plan means fewer hikers on Half Dome
Last year park officials instituted a temporary 400-permit lottery for daily access, which is roughly from Memorial Day until the first snow in October.Could you please help me understand the meaning of the sentence in red above? Does 'hairball' mean something very 'complicated' or 'difficult', in this context?
"I think they're doing a fine job, but I think they've got a hairball that they're dealing with trying to come up with something that works," said Rick Deutsch, who wrote the book "One Best Hike: Yosemite's Half Dome." He says 400 permits is a more workable number that accounts for no-shows.