PK, a whole bunch of things *don’t* happen when you install the RPM, like adding the service script to /etc/init.d, create and populate /etc/hadoop-httpfs and /var/lib, etc. I assume that’s based on post-script not running due to this post: http://hortonworks.com/community/forums/topic/hadoop-httpfs-install-issues-in-hdp-2-2/
To get it working, copy the service file, symlink the config and tomcat-deployment directories from /usr/hdp/2.2.0.0-2041/etc/hadoop-httpfs/, and symlink the tomcat bin and lib directories from bigtable into tomcat-deployment