Grape

Introduction

Grape is a decentralized distribution memory caching system, using consistent hashing to decide which node to store the data in. Grape support redis SET and GET command, it's easy to use the redis-cli to add or remove a node from cluster. Because the grape like a architecture of peer-to-peer systems, you can use redis client to connect any of a node of cluster, and the connecting node will send request to destination node.

Installation

go get -v github.com/leviathan1995/grape/

Getting Started

Creating and using a cluster

First start a double-member cluster, each node set the peer-server as RemotePeers in config file

./grape -c tests/node1.yaml
./grape -c tests/node2.yaml

Next, connect to any of a node and store a key-value and retrieve the stored key

./redis-cli -p 9221
127.0.0.1:9221> SET key value
OK
127.0.0.1:9221> GET key
"value"

Adding a new node

if you want to add a node3 to the exist cluster, need to configurate any of a node in cluster to RemotePeers in config file

./grape -c test/node3.yaml

and it will be automatically join the cluster

Removing a node

Connect any of a node in cluster, use REMOVE IP PORT

./redis-cli -p 9221
127.0.0.1:9221> REMOVE 127.0.0.1 9001
OK

TODO

• TTL
• LRU algorithm
• Monitor nodes survival