overlord

Overlord

Overlord is a proxy based high performance Memcached and Redis solution written in Go.
It is fast and lightweight and used primarily to horizontally scale your distributed caching architecture.
It is inspired by Twemproxy,Codis.

Quick Start

Download

cd $GOPATH/src
git clone https://github.com/felixhao/overlord.git

Build

cd $GOPATH/src/overlord/cmd/proxy
go build

Run

./proxy -cluster=proxy-cluster-example.toml

Test

# test memcache
echo -e "set a_11 0 0 5\r\nhello\r\n" | nc 127.0.0.1 21211
# STORED
echo -e "get a_11\r\n" | nc 127.0.0.1 21211
# VALUE a_11 0 5
# hello
# END

# test redis
python ./scripts/validate_redis_features.py # require fakeredis==0.11.0 redis==2.10.6 gevent==1.3.5

Congratulations! You've just run the overlord proxy.

Features

• support memcache protocol
• support redis&cluster protocol
• connection pool for reduce number to backend caching servers
• keepalive & failover
• hash tag: specify the part of the key used for hashing
• promethues stat metrics support
• cache backup
• hot reload: add/remove cache node
• QoS: limit/breaker
• L1&L2 cache
• hot|cold cache
• broadcast
• cache node scheduler

Architecture

Contributing

Overlord is probably not perfect, but you are welcome to use it in your dev/test/product and so please let me know if anything feels wrong or incomplete.
I'm trying very hard to keep it simple and fast. And I always happy to receive pull requests. It follow the gitflow, please send you pull request to develop branch.