[]()中文 []()english

HanboDB

hanboDB is a high available,low latency memory database system.

features

  1. support dynamic resize

  2. support all of redis proto,e.g:

    1.set get
2.lpush rpush lrange blpop brpop llen
3.hset hget hgetall hscan
4.pub sub
5.select keys scan expire del
6.multi exec discard
7.incr incrby
8.slaveof
....

architecture

use fastUtil library(Object2List,Object2Map) as keyMap in JVM,it has a powerful read/write ability.

storage design

buffer-structure

replication

linear storage

1.fixed unit size ,head 4 byte write in last item position,
and then each item write in 4 byte with it bytes length and actually bytes(TLV).
2.key and value are seperated in storage
3.if buffer remaining not enough to write,then auto resize

build server

cd jredis && mvn clean install -Dmaven.test.skip=true

run server

java -jar transport-1.0-SNAPSHOT.jar

ha conf

support one master multi slave,but not support auto selective master,now need to manual promotion. i will plan to implement sentinel mechanism

master

auto discovery slave node

replication.mode=master

slave

auto register slave node

replication.mode=slave
slaver.of=127.0.0.1:16379