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clandestined-python

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python rendezvous hashing implementation based on murmur3 hash

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clandestined
===========

rendezvous hashing implementation based on murmur3 hash

## motivation

in distributed systems, the need often arises to locate objects amongst a
cluster of machines. consistent hashing and rendezvous hashing are methods of
performing this task, while minimizing data movement on cluster topology
changes.

clandestined is a library for rendezvous hashing which has the goal of simple
clients and ease of use.

Currently Supported Interpreters:
  - Python 2.5 through Python 3.8
  - PyPy and PyPy3

[![Build Status](https://travis-ci.org/ewdurbin/clandestined-python.svg?branch=master)](https://travis-ci.org/ewdurbin/clandestined-python)

## example usage

```python
>>> from clandestined import Cluster
>>>
>>> nodes = {
...     '1': {'name': 'node1.example.com', 'zone': 'us-east-1a'},
...     '2': {'name': 'node2.example.com', 'zone': 'us-east-1a'},
...     '3': {'name': 'node3.example.com', 'zone': 'us-east-1a'},
...     '4': {'name': 'node4.example.com', 'zone': 'us-east-1b'},
...     '5': {'name': 'node5.example.com', 'zone': 'us-east-1b'},
...     '6': {'name': 'node6.example.com', 'zone': 'us-east-1b'},
...     '7': {'name': 'node7.example.com', 'zone': 'us-east-1c'},
...     '8': {'name': 'node8.example.com', 'zone': 'us-east-1c'},
...     '9': {'name': 'node9.example.com', 'zone': 'us-east-1c'},
... }
>>>
>>> cluster = Cluster(nodes)
>>> cluster.find_nodes('mykey')
['4', '8']
>>>
```

by default, `Cluster` will place 2 replicas around the cluster taking care to
place the second replica in a separate zone from the first.

in the event that your cluster doesn't need zone awareness, you can either
invoke the `RendezvousHash` class directly, or use a `Cluster` with replicas
set to 1

```python
>>> from clandestined import Cluster
>>> from clandestined import RendezvousHash
>>>
>>> nodes = {
...     '1': {'name': 'node1.example.com'},
...     '2': {'name': 'node2.example.com'},
...     '3': {'name': 'node3.example.com'},
...     '4': {'name': 'node4.example.com'},
...     '5': {'name': 'node5.example.com'},
...     '6': {'name': 'node6.example.com'},
...     '7': {'name': 'node7.example.com'},
...     '8': {'name': 'node8.example.com'},
...     '9': {'name': 'node9.example.com'},
... }
>>>
>>> cluster = Cluster(nodes, replicas=1)
>>> rendezvous = RendezvousHash(nodes.keys())
>>>
>>> cluster.find_nodes('mykey')
['4']
>>> rendezvous.find_node('mykey')
'4'
>>>
```

## advanced usage

### murmur3 seeding

**DISCLAIMER**

clandestined was not designed with consideration for untrusted input, please
see LICENSE.

**END DISCLAIMER**

if you plan to use keys based on untrusted input (not supported, but go
ahead), it would be best to use a custom seed for hashing. although this
technique is by no means a way to fully mitigate a DoS attack using crafted
keys, it may make you sleep better at night.

```python
>>> from clandestined import Cluster
>>> from clandestined import RendezvousHash
>>>
>>> nodes = {
...     '1': {'name': 'node1.example.com'},
...     '2': {'name': 'node2.example.com'},
...     '3': {'name': 'node3.example.com'},
...     '4': {'name': 'node4.example.com'},
...     '5': {'name': 'node5.example.com'},
...     '6': {'name': 'node6.example.com'},
...     '7': {'name': 'node7.example.com'},
...     '8': {'name': 'node8.example.com'},
...     '9': {'name': 'node9.example.com'},
... }
>>>
>>> cluster = Cluster(nodes, replicas=1, seed=1337)
>>> rendezvous = RendezvousHash(nodes.keys(), seed=1337)
>>>
>>> cluster.find_nodes('mykey')
['7']
>>> rendezvous.find_node('mykey')
'7'
>>>
```

## contributors

Thanks to the following contributors for their aid in making this project great:

- [John Anderson](https://github.com/sontek)
- [Chris O'Hara](https://github.com/chriso)

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