更新：本项目的依赖库actix-raft已更名为async-raft,其中缺乏的pre-vote在新版本中已完全实现，新库支持Rust Async/await异步语法，使用了Async-trait库. This version support RocksDB as storage.
this version support first start as singlenode,after other node join this single node cluster, attention, this style started cluster must keep two nodes at least.
This implemention include Rust (actix-raft) raft implemention and RocksDB as storage implemention,RocksDB save the raft states and Key-Value data.the default path is /tmp/rocksdb.
prepare for 3 or 5 nodes server,please use docker,ips is :172.17.0.1,172.17.0.2,172.17.0.3,172.17.0.4 172.17.0.5.
1, require build RocksDB lib,please google search to build RocksDB lib.
2,git clone https://github.com/ryanjackgit/sand
3, cd sand cargo build
4, first start alone as single node server :
./target/debug/sand 172.17.0.1:8000 172.17.0.1:9000 then please wait 5 seconds,the single node cluser works.
5, in sand/config.json,set discovery_server="172.17.0.1:9000" as discovery node .
start 3 nodes cluster: of course ,you may add more.
./target/debug/sand 172.17.0.2:8000 172.17.0.2:9000
./target/debug/sand 172.17.0.3:8000 172.17.0.3:9000
./target/debug/sand 172.17.0.4:8000 172.17.0.4:9000
./target/debug/sand 172.17.0.5:8000 172.17.0.5:9000
8000 is a port about raft internal comunnication,9000 is http port.
- test the cluster running state:
http://172.17.0.1:9000/put/{{key}}/{{value}} write Key-value to cluster.
http://127.0.0.1:9000/get/{{Key}} verify,if key in this node.it return true,if not in this node,return false. http://127.0.0.3:9000/get/{{Key}}
of course,you may test every node see if or not it save this key-value data.
说明： 1，Actix-raft 是Rust中实现Raft规范协议比较完全的一个，基本实现了所有标准规范的所有功能，可以投入产品中使用,只是目前Pre-vote暂未实现。 目前使用了Actor模型。 2，分布式的Key-Value主要使用了muti raft,对Key使用范围分区或哈西分区来实现分布式存储。主要包括分区的重新划分和重新聚集分片。 3, 整体架构图如下：
