Implements consistent hashing with Python and the algorithm is the same as libketama.
Project description
consistent-hash
Implements consistent hashing that can be used when the number of server nodes can increase or decrease.The algorithm that is used for consistent hashing is the same as libketama <https://github.com/RJ/ketama>
Usage
It’s so easy to use^_^:
from consistent_hash import ConsistentHash # You can construct consistent hash with the below three ways con_hash = ConsistentHash({'192.168.0.101:11212':1, '192.168.0.102:11212':2, '192.168.0.103:11212':1}) # Or con_hash = ConsistentHash(['192.168.0.101:11212', '192.168.0.102:11212', '192.168.0.103:11212'])) # Or con_hash = ConsistentHash('192.168.0.101:11212') # Add servers to hash ring con_hash.add_nodes({'192.168.0.104:11212':1}) # Get a server via the key of object server = con_hash.get_node('my_key') # Delete the server from hash ring, you don't need to indicate weights con_hash.del_nodes(['192.168.0.102:11212', '192.168.0.104:11212'])
Unit test
Firstly, install nose which extends unittest to make testing easier:
pip install nose
Then, run tests:
# Option -s any stdout output will be printed immediately # and -v be more verbose nosetests -s -v
More information about nose <https://nose.readthedocs.org/en/latest/>
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