A simple introduction to redis

Mar 29, 2012Download as PPTX, PDF4 likes3,041 views

Redis is an open source, advanced key-value store that can be used as a data structure server since it supports strings, hashes, lists, sets and sorted sets. It is written in C, works on most POSIX systems, and can be accessed from many programming languages. Redis provides options for data persistence like snapshots and write-ahead logging, and can be replicated for scalability and high availability. It supports master-slave replication, sentinel-based master detection, and sharding via Redis clusters. Redis has been widely adopted by many companies and is used in applications like microblogging services.

A Simple Introduction to Redis
Zhichao Liang
frankey0207@gmail.com

What’s Redis?
• Redis is an open source, advanced key-value store. It
is often referred to as a data structure server since
keys can contain strings, hashes, lists, sets and sorted
sets.
• Redis is written in ANSI C and works in most POSIX
systems like Linux, *BSD, OS X and Solaris without
external dependencies.
• Redis can be used from most programming
languages, such as C, C#, C++, Java, Lua, Node.js, Perl,
Objective-C, PHP, Python, Ruby, Smalltalk, Scala,
Erlang, Common Lisp …

How to use Redis?
• We can download the source code of Redis from
http://redis.io/download and install it just by make
&& make install.
• By default, both the server and client of Redis can be
found in the directory /usr/local/bin after installation.
• Some common commands:
- set/get/mset/mget
- lpush/rpush/lpop/rpop
- hset/hget/hmset/hmget
- sadd/smembers/zadd/zrange

C Client
• Hiredis is a official C client library for the Redis
database.
• We can download Hiredis from
https://github.com/antirez/hiredis/downloads.
redisContext *c = redisConnect("127.0.0.1", 6379);
if (c->err) {
printf("Error: %sn", c->errstr);
}
reply = redisCommand(redisContext , "SET foo bar");

Java Client
• Jedis is a blazingly small and sane Redis java client.
• We can download Jedis package from
https://github.com/xetorthio/jedis/downloads.
Jedis jedis = new Jedis("localhost");
jedis.connect();
jedis.set("foo", "bar");
String value = jedis.get("foo");

Redis Persistence
• Redis provides a different range of persistence
options: RDB and AOF.
• The RDB persistence performs point-in-time
snapshots of your dataset at specified intervals.
- #save 900 1 or #save 300 10
• The AOF persistence logs every write operation
received by the server, that will be played again at
server startup, reconstructing the original dataset.
- no fsync at all or fsync every second or fsync at
every query

Redis Replication
• Redis master-slave replication allows slave Redis
servers to be exact copies of master.
- A master can have multiple
slaves slave
-Slaves can accept other
slaves connections
master
- Non-blocking at the master
side
slave
- Replication can be used for
scalability
- Replication can avoid saving
process at master side

Redis Cluster
• Redis nodes are connected and functionally
equivalent, but actually there are two kinds of nodes:
master nodes and slave nodes.
1
0 4
2 3
1
3 5
4 master 0
slave 2

0 5
2
1
5 4
3

Who’s using Redis?
• Redis has been widely used in microblog service
redis> hset yaochen follows 547
(integer) 1 by Sina Weibo.
provied
redis> hset yaochen fans 17647778
(integer) 1
redis> hset yaochen microblogs
5359
(integer) 1
redis> hgetall yaochen
1) “follows"
2) “547"
3) "fans"
4) “17647778"
5) "microblogs"
6) “5359"

This document provides an overview and introduction to Redis, including: - Redis is an open source, in-memory data structure store that can be used as a database, cache, and message broker. - It supports common data structures like strings, hashes, lists, sets, sorted sets with operations like GET, SET, LPUSH, SADD. - Redis has advantages like speed, rich feature set, replication, and persistence to disk. - The document outlines how to install and use Redis, and covers additional features like pub/sub, transactions, security and backup.

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A simple introduction to redis

1. A Simple Introduction to Redis Zhichao Liang [email protected]

2. What’s Redis? • Redis is an open source, advanced key-value store. It is often referred to as a data structure server since keys can contain strings, hashes, lists, sets and sorted sets. • Redis is written in ANSI C and works in most POSIX systems like Linux, *BSD, OS X and Solaris without external dependencies. • Redis can be used from most programming languages, such as C, C#, C++, Java, Lua, Node.js, Perl, Objective-C, PHP, Python, Ruby, Smalltalk, Scala, Erlang, Common Lisp …

3. How to use Redis? • We can download the source code of Redis from http://redis.io/download and install it just by make && make install. • By default, both the server and client of Redis can be found in the directory /usr/local/bin after installation. • Some common commands: - set/get/mset/mget - lpush/rpush/lpop/rpop - hset/hget/hmset/hmget - sadd/smembers/zadd/zrange

4. C Client • Hiredis is a official C client library for the Redis database. • We can download Hiredis from https://github.com/antirez/hiredis/downloads. redisContext *c = redisConnect("127.0.0.1", 6379); if (c->err) { printf("Error: %sn", c->errstr); } reply = redisCommand(redisContext , "SET foo bar");

5. Java Client • Jedis is a blazingly small and sane Redis java client. • We can download Jedis package from https://github.com/xetorthio/jedis/downloads. Jedis jedis = new Jedis("localhost"); jedis.connect(); jedis.set("foo", "bar"); String value = jedis.get("foo");

6. Redis Persistence • Redis provides a different range of persistence options: RDB and AOF. • The RDB persistence performs point-in-time snapshots of your dataset at specified intervals. - #save 900 1 or #save 300 10 • The AOF persistence logs every write operation received by the server, that will be played again at server startup, reconstructing the original dataset. - no fsync at all or fsync every second or fsync at every query

7. Redis Replication • Redis master-slave replication allows slave Redis servers to be exact copies of master. - A master can have multiple slaves slave -Slaves can accept other slaves connections master - Non-blocking at the master side slave - Replication can be used for scalability - Replication can avoid saving process at master side

8. Redis Cluster • Redis nodes are connected and functionally equivalent, but actually there are two kinds of nodes: master nodes and slave nodes. 1 0 4 2 3 1 3 5 4 master 0 slave 2 0 5 2 1 5 4 3

9. Redis Replication

10. Who’s using Redis? • Redis has been widely used in microblog service redis> hset yaochen follows 547 (integer) 1 by Sina Weibo. provied redis> hset yaochen fans 17647778 (integer) 1 redis> hset yaochen microblogs 5359 (integer) 1 redis> hgetall yaochen 1) “follows" 2) “547" 3) "fans" 4) “17647778" 5) "microblogs" 6) “5359"

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