I found two interesting vm options used in Casandra by default: "-XX:+UseThreadPriorities -XX:ThreadPriorityPolicy=42", Here is a good article for it : http://tech.stolsvik.com/2010/01/linux-java-thread-priorities-workaround.html
My point is do we need to enable these two options? Just did a quick grep,shows "DaemonThreadFactory" class is using this thread priority feature right now. Looks to me it's a minor issue, just curious:) Thanks, Liang
