I thought we were using it in AppenderControlArraySet for example, but it doesn't look like it really matches the idea. I've been reading through all the JEPs in JDK9 to see if there's anything else useful we haven't already marked in our epic <https://issues.apache.org/jira/browse/LOG4J2-1564>, and I found Thread.onSpinWait() <http://openjdk.java.net/jeps/285> which looked useful, but I'm not sure of anywhere we could use it.
-- Matt Sicker <boa...@gmail.com>