A key tag is a special pattern inside a key that, if preset, is the only part of the key hashed
in order to select the server for this key.
@see <a href="http://redis.io/topics/partitioning">partitioning</a>
@param key
@return The tag if it exists, or the original key
A key tag is a special pattern inside a key that, if preset, is the only part of the key hashed in order to select the server for this key. @see <a href="http://redis.io/topics/partitioning">partitioning</a> @param key @return The tag if it exists, or the original key