disqus/nydus — pull request #22 by Helielson (2012-11-16 14:57:48+00:00)
Title: Improvement in add_node calls

I did this change for performance improvement.
I think it's not necessary to add the node key to hash if the node key was already added.
After this change, the redis access time decreased 75%.
@dcramer, I didn't found any test case where the node key was None.
What's the better way to test it?