1. BUILDING NOTIFICATION, FEEDING
SYSTEM USE NODE.JS + REDIS
Lê Việt Đức
19/04/2012

2. Content
• Intro
• Design Systems
• Redis Replication
• Demo
• Discussion

3. Solution 1
1 node.js thread: ~ 1000 CCU
Client 1
Redis->subcribe
Play.go.vn
Client 2
Redis Server Application Server
Node.js Server
Client n

4. Node.js Script
client1 = redis.createClient(6379,'117.103.196.26');
client1.subscribe("notify");
client1.on("message", function (channel, message) {
var objmsg = eval(message);
nowjs.getGroup(channel).now.receiveNotifyPlaying(objmsg.clientId,ob
jmsg.userid,objmsg.name,objmsg.room_notify,objmsg.app_title,objms
g.app_url,objmsg.action_title);
});

5. Server Script (PHP)
$notify_server = array(
'host'=>'117.103.196.20',
'port' => 6381,
'database' => 3
);
$Redis_notify = new Predis_Client($notify_server);
$msg = '({"clientId":"'.time().'","userid":"'.$userid.'","name":"'.
$displayname.'","room_notify":"notify","app_title":"'.
$title.'","app_url":"'.$link.'","action_title":"'.$action_title.'"})';
$rt = $Redis_notify->publish(array('notify',$msg));

6. Solution 2
Re
dis
->s
ub
cri
be
Client 1
Node.js Server
Redis->publish()
Play.go.vn
Client 2
Node.js Server
Redis Server Application Server
Client n
Node.js Server

7. Solution 3
Redis->subcribe
Client 1 Redis Server
Node.js Server
Redis->subcribe
Redis->publish()
Play.go.vn
Client 2
Node.js Server
Redis Server Application Server
Client n
Node.js Server
Redis Server

8. Redis Replication
Redis replication is a very simple to use and configure master-slave replication
that allows slave Redis servers to be exact copies of master servers

9. Redis Replication
•A master can have multiple slaves.
•Slaves are able to accept other slaves connections.
•Redis replication is non-blocking on the master side, this means that the master will
continue to serve queries when one or more slaves perform the first synchronization.
•Replication is non blocking on the slave side: while the slave is performing the first
synchronization it can reply to queries using the old version of the data set, assuming you
configured Redis to do so in redis.conf.
•Replications can be used both for scalability, in order to have multiple slaves for read-only
queries.

10. Configuration
slaveof 192.168.1.1 6379
masterauth <password>

11. Solution 4
Redis->subcribe
Client 1
Node.js Server Redis Slave Server
Redis->subcribe
Play.go.vn
Redis->publish()
Client 2
Node.js Server Redis Slave Server Redis Master Server
Application Server
Redis Slave Server
Client n
Node.js Server

12. Discussion

13. QUESTIONS?