Minor Description
If the callable queue is empty, and you run the queue dump command, the message says:
# oozie admin queuedump [Server Queue Dump]: Queue dump is null! ****************************************** [Server Uniqueness Map Dump]: Uniqueness dump is null!
This message makes it sound like a bad thing, especially the exclamation mark. We should change the message to something more neutral and helpful, like "The queue is empty" or something like that.