I'm a little confused - what log files are you looking for? How does this connect to you wanting to erase your HD/Yosemite installer?
Ok, so my computer is asking for a restart currently running 10.9.4 everyday it asks for an update to yosemite today it just said restart to complete update im guessing ts installed but not yet running. Is there a way to erase it?
No, it's already installed. Why don't you give it a try for awhile and then if you don't like it, you can restore Mavericks from your Time Machine backup.