redis/redis-rb — pull request #354 by axos88 (2013-07-26 09:52:56+00:00)
Title: Fix distributed db ring collision

I have added a test to the HashRing#add_node that will test if a node ID's CRC checksum is already present and will throw an exception in such a case.
This enables to prevent quiet CRC collisions and adding databases which have the same ID, but are not identical. I had this error when adding multiple MockRedis objects to the ring which had the same ID.