Netflix Dynomite/Dyno: The Cluster for Redis


Dynomite is brilliant. Kudos for NetflixOSS team because it kicks ass. First all they mixed several interesting, battle tested and sexy architectural ideas and deliver into a single solution. What would be Dynomite? You can think as a kick Ass Cluster for Memcached and Redis. But its way more than that. Dynomite is integrated with the Netflix Stack so you can use with Eureka and the rest of the stack. You dont need use Redis or Memcached if you dont want because Dynomite is modular so you can use the NoSQL or thing behind it.

Dynomite is based on the Amazon Dynamo paper, so it implements the Consistence Hashing Ring, with quorum-like mechanisms, so you can have strong consistency and dont loss data(similar to Cassandra and Riak) and also have some low latency and high throughput using Redis or Memcached Behind. Dynomite is written in C and its a proxy, it uses the twitter twemproxy as base solution. Replication is a aymetric, dynomite has a java client called Dyno with has Token Aware load balancing. On the consistency side you can do: DC_ONE: Sync same AZ, Async other Region or DC_QUORUN: Sync to the mun of the quorum.
Performance is amazing, check this benchmarks by Netflix folks. They used a R3.Xlarge instance with replication factor set to 3 in 3 amazon zones, they used in front of Redis and did some set of GET and SET operations. The ratio between reads and writes was 80% reads and 20% writes(pretty much Netflix scenario)



Dyno Client Features

One of the great things about the client(Dyno) is that you can choose the client you want use, so for redis you can use Jedis or Redisson for instance but since dyno is modular you can code to integrated other clients if you like it more. Some key features in dyno are:

    * Connection pooling of persistent connections - this helps reduce connection churn on the Dynomite server with client connection reuse.
    * Topology aware load balancing (Token Aware) for avoiding any intermediate hops to a Dynomite coordinator node that is not the owner of the specified data.
    * Application specific local rack affinity based request routing to Dynomite nodes.
    * Application resilience by intelligently failing over to remote racks when local Dynomite rack nodes fail.
    * Application resilience against network glitches by constantly monitoring connection health and recycling unhealthy connections.
    * Capability of surgically routing traffic away from any nodes that need to be taken offline for maintenance.
    * Flexible retry policies such as exponential backoff etc
    * Insight into connection pool metrics
    * Highly configurable and pluggable connection pool components for implementing your advanced features.

Installing, Configuring and Running

Download and install Java JDK 8

sudo yum update -y
sudo yum remove java -y
cd /opt
sudo wget --no-cookies --no-check-certificate --header "Cookie: gpw_e24=http%3A%2F%2Fwww.oracle.com%2F; oraclelicense=accept-securebackup-cookie" "http://download.oracle.com/otn-pub/java/jdk/8u45-b14/jdk-8u45-linux-x64.tar.gz"
sudo tar -xzvf jdk-8u45-linux-x64.tar.gz
sudo rm -rf jdk-8u45-linux-x64.tar.gz

ENV Vars $ sudo vim ~/.bashrc

alias cls='clear'
export JAVA_HOME=/opt/jdk1.8.0_45
export JRE_HOME=/opt/jdk1.8.0_45/jre
export PATH=$PATH:/opt/jdk1.8.0_45/bin:/opt/jdk1.8.0_45/jre/bin

Download Git and downlaod Dynomite Code, Build Dynomite

sudo yum install git -y
sudo git clone https://github.com/Netflix/dynomite.git
cd dynomite
sudo yum install -y autoconf automake
sudo yum install -y libtool
sudo yum install -y openssl-devel
sudo autoreconf -fvi
sudo ./configure --enable-debug=log
sudo make

Testing the Installation

src/dynomite -h

Install Redis cluster on Amazon Linux OS

sudo yum -y upgrade
sudo yum install -y gcc*
sudo yum install -y tcl
sudo wget http://download.redis.io/releases/redis-3.0.4.tar.gz
sudo tar xzf redis-3.0.4.tar.gz
cd redis-3.0.4
cd deps ; sudo make hiredis jemalloc linenoise lua ; cd ..
sudo make
sudo make test
sudo make install
cd utils ; sudo chmod +x install_server.sh ; sudo ./install_server.sh

It will ask you for the Redis Executable - it should be: /usr/local/bin/redis-server Them you can check for redis service

sudo service redis_6379 status

Config Dyno for Single Redis

sudo touch redis_single.yml
sudo vi redis_single.yml

ADD this content

dyn_o_mite:
  dyn_listen: 127.0.0.1:8101
  data_store: 0
  listen: 127.0.0.1:8102
  dyn_seed_provider: simple_provider 
  servers:
  - 127.0.0.1:6379:1
  tokens: 437425602

Run Dyno

sudo src/dynomite -c redis_single.yml
view raw dynomite.md hosted with ❤ by GitHub

Cheers,
Diego Pacheco

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