Talk presented at Malaysian Open Source Conference 2012 (09-07-12) : Using the right tools for the right job. Yeah right! So what is your problem? Your farmville-like online games empire gaining momentum as what you never dream of? Your data read and write is close to maximum which make options like write through cache or other common scaling agendas less fun and not really effective? You’re getting tired of traditional RDBMS and all the bru-ha-ha over oldSQL, NoSQL and NewSQL? Redis might address (some) of your problems. It works with an in-memory dataset as an advanced key-value store often referred as data structure server that can runs multiple atomic operations. This session will uncover the beauty and practicality of Redis and how it works with most languages especially PHP.

1. Rediscover Speed With
Redis (and PHP)
Errazudin Ishak

2. Agenda
About Me
What on earth
For what reason
So how to do that
Can I use it with
Ok, now what
Summary

3. ABOUT ME

4. Day job
Staff Engineer @ Mimos Bhd Malaysia
Focuses on web application development,
deployment, performance, security and
stability.

5. I was here..
2009
foss.my , MyGOSSCON
2010
Entp. PHP Techtalk, BarcampKL, PHP Meetup, MOSC2010,
PHP Northwest UK, MyGOSSCON
2011
INTAN Tech Update, Wordpress Conf. Asia, Joomla! Day, MOSC,
OWASP Day
2012
OWASP Appsec Asia Pacific, Australia

7. WHAT ON EARTH

8. NoSQL Family
Key value stores : Redis, Voldemort,
Cassandra

9. NoSQL Family
Column oriented : cass, hbase

10. NoSQL Family
Doc collection db : CouchDB, MongoDB

11. NoSQL Family
Graph DB : Neo4j, AllegroGraph

12. Redis
REmote Dictionary Server
Advanced Key-value store
Disk backed In-memory database (with virt
mem)
High write throughput (30-150k ops/sec)
Data structures (list, hashes, sets, atomic
ops)

13. Redis, unique?
Simple, lightweight
In memory (RAM).. Fast, fast, fast (very!)
Disk-backed, background writes
Master-slave config.
Multi language support

14. FOR WHAT REASON

15. Source : http://goo.gl/CM7wq
“Memory is the new disk. Disk is the
new tape.” - Jim Gray
Source : http://www.infoq.com/news/2008/06/ram-is-disk

16. Issue : Write heavy workload
Scaling reads : easy
Scaling write : headache

17. Advanced key-value store
Persistence
Replication
Transaction
Pipelining
Publish/Subscribe

18. Use cases
Realtime analytics
Caching server (memcached on steroid)
Queue (scheduler, take time to process)
Clicks (eg. Reddit, digg)

19. Who
“We also use Redis extensively; it
powers our main feed, our activity feed,
our sessions system…”

20. Who

21. Who
• flickr

22. Who

23. Who

24. Who

25. SO HOW TO DO THAT

26. Get, Set.. Go!
Installation
Download, extract and compile
http://redis.io/download
…and redis-server and redis-cli, ready to
rumble

27. Get, Set.. Go!
$ wget http://redis.googlecode.com/files/redis-
2.4.15.tar.gz
$ tar xzf redis-2.4.15.tar.gz
$ cd redis-2.4.15
$ make

28. Data Structure server
Strings
SET, GET, SETRANGE, INCR, DECR
Lists
LPUSH, RPUSH, RPOP, LRANGE…
Sets
SADD, SINTER, SMEMBER, ZADD …
Hashes
HSET, HMSET, HGETALL

29. Strings
Basic
512MB
As atomic counters
Append to Strings
Random access
Encode lots with little space

30. Lists
List of Strings
Max length of a list is 232 - 1 elements
(4294967295, more than 4 billion of
elements per list).

31. Sets
Collection of Strings (unordered)
Support a number of server side commands
to compute sets
Max number of members in a set is 232 - 1
(4294967295, more than 4 billion of
members per set).

32. Hashes
Maps between string fields and string
values

33. CAN I USE IT WITH …

34. PHP : Strings
$src/redis-cli
redis> set hello earth
OK
redis> get hello
“earth”
<?php
$redis = new Redis();
$redis->connect('127.0.0.1',6379);
$redis->set(„hello',„earth');
$stored = $redis->get(„hello');
echo $stored;

35. PHP : Strings
$src/redis-cli
redis>set mosc"{"a":"1","b":"2"}“
OK
redis>get mosc
"{"a":"1","b":"2"}“
<?php
$redis = new Redis();
$redis->connect('127.0.0.1',6379);
$data = array('a'=>'1','b'=>'2');
$json = json_encode($data);
$redis->set(„mosc',$json);
$stored = $redis->get(„mosc');
echo $stored;

36. PHP : Lists
redis>LPUSH mylist “earth"(integer)1
redis>LPUSH mylist "hello"(integer)2
//[„earth','hello']
redis>LRANGE mylist 0-1
1)"hello“
2)“earth"

37. PHP : Lists
<?php
$redis = new Redis();
$redis->connect('127.0.0.1',6379);
$redis->delete('key1');
$redis->rpush('key1','A');//returns 1
$redis->rpush('key1','B');//returns 2
$redis->rpush('key1','C');//returns 3
$redis->rpush('key1','A');//returns 4
/*key1nowpointstothefollowinglist:['A','B','C','A']*/

38. PHP : Sets
<?php
$redis = new Redis();
$redis->connect('127.0.0.1',6379);
$redis->delete('key2');
$redis->sadd('key2','A');//returns 1
$redis->sadd('key2','B');//returns 2
$redis->sadd('key2','C');//returns 3
$redis->sadd('key2','A');//returns false
/*key2nowpointstothefollowinglist:['A','B','C']*/

39. PHP : Hashes
redis>hmset firsthash a "1“ b “2“ c "3“ d "4“
OK
redis>hget firsthash c
"3“
redis>hset firsthash e "5“
(integer) 1
redis>hget firsthash e
"5“
redis>hget firsthash d
"4"

40. PHP : Hashes
<?php
$redis = new Redis();
$redis->connect('127.0.0.1',6379);
$redis->delete('user:1');
$redis->hmset('user:1',
array('name'=>„Zack','salary'=>3000));
//Give Zack a $200 Raise:
$redis->hincrby('user:1','salary',200);

41. PHP : Hashes
<?php
$redis = new Redis();
$redis->connect('127.0.0.1',6379);
$redis->hmset('user:2',
array('name'=>„Ali','salary'=>5000));
$redis->hmset('user:3',
array('name'=>„Jonah','salary'=>6000));
$uid=3;
$user=$redis->hgetall('user:'.$uid)
//{name:„Jonah',salary:6000}
echo $user['salary'];//6000

42. PHP : Pub/Sub
redis>subscribe chn801
redis>subscribe chn611

43. PHP : Pub/Sub
redis>publish chn801 “Kelantan 6-0 Perak”
redis>subscribe chn801
Reading messages…
1) “subscribe”
2) “chn801”
3) (integer) 1
1) “message”
2) “chn801”
3) “Kelantan 6-0 Perak”

44. PHP Clients
Predis
https://github.com/nrk/predis
Phpredis
https://github.com/nicolasff/phpredis

45. OK, NOW WHAT

46. Source : http://goo.gl/sPZQ6
“Redis is more than a key-value store,
it’s a lifestyle” – Mathias Meyer

47. Redis Cluster?
Target : Redis 2.6
Unstable branch – Basis/fundamental parts
Release when rock solid and useful
End of 2012?

48. SUMMARY

49. “Different technologies excel at
different things” – Weixi Yen

50. Resources
Redis commands
http://redis.io/commands
Redis Manifesto
http://antirez.com/post/redis-
manifesto.html

51. Resources
Redis Cookbook

52. Resources
http://simonwillison.net/static/2010/redis-
tutorial/

53. Diving deeper?
Peter Cooper’s
http://www.scribd.com/doc/33531219/Redi
s-Presentation
Pre-order
Redis: The Definitive Guide
(Data modeling, caching, and
messaging)

54. Diving deeper?
Scaling Redis
http://petrohi.me/post/6323289515/scalin
g-redis
Instagram Engineering blog
http://instagram-engineering.tumblr.com/