The jenkins-1.565-1.1 RPM contains a post-install script with performs the following:
These chowns can take a very long time on systems with lots of files. A couple of our Jenkins boxes have thousands of files in a the /var/lib/jenkins/workspace directory (which itself is a network mount), which means this chown takes many minutes to complete (like ~15 minutes) and actually changes the ownership of no files. This holds up package deployment unnecessarily.
I propose that either these chowns be removed entirely (the RPM spec sets the ownership of things the RPM puts down), or better yet that they're restricted to specific files.