python -- 一致性Hash

python有一个python模块--hash_ring，即python中的一致性hash，使用起来也挺简单。

可以参考下官方例子：https://pypi.python.org/pypi/hash_ring/

 1 Basic example of usage (for managing memcached instances):
 2 
 3 memcache_servers = ['192.168.0.246:11212',
 4                     '192.168.0.247:11212',
 5                     '192.168.0.249:11212']
 6 
 7 ring = HashRing(memcache_servers)
 8 server = ring.get_node('my_key')
 9 Example using weights:
10 
11 memcache_servers = ['192.168.0.246:11212',
12                     '192.168.0.247:11212',
13                     '192.168.0.249:11212']
14 weights = {
15     '192.168.0.246:11212': 1,
16     '192.168.0.247:11212': 2,
17     '192.168.0.249:11212': 1
18 }
19 
20 ring = HashRing(memcache_servers, weights)
21 server = ring.get_node('my_key')

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