Redis is an open-source, in-memory data structure store that allows for atomic operations on data structures like strings, hashes, lists, sets, sorted sets, and bitmaps. It supports common operations like push, pop, and get and can be used as a cache, for session storage, or to compute statistics. StackExchange uses Redis with two servers each with 96GB RAM handling over 60k requests per second on average.

1. Yuriy Guts
Software Architect @ ELEKS

2. Redis is an open-source (BSD), networked, in-memory key-value cache
and store with optional durability.
Commonly called a data structure server.

3. • Insanely fast
• Available for distributed environment by design
• Allows atomic operations specific to data structures

4. • String
• Hash
• List
• Set
• Sorted Set
• Bitmap
• HyperLogLog

5. LPUSH people Alice
[“Alice”]
LPUSH people Bob
[“Bob”, “Alice”]
RPUSH people Charlie
[“Bob”, “Alice”, “Charlie”]
EXPIRE people 120
COMMAND <arg0> <arg1> ... <argN>

6. using (IRedisNativeClient redisNativeClient = new RedisNativeClient())
{
redisNativeClient.LPush("lastVisitorIds", BitConverter.GetBytes(113));
redisNativeClient.LPush("lastVisitorIds", BitConverter.GetBytes(61));
redisNativeClient.LPush("lastVisitorIds", BitConverter.GetBytes(2481));
}

7. using (IRedisClient redisClient = new RedisClient())
{
var book = new Book()
{
Id = 5,
Author = new Author
{
Name = "Jeffrey Richter",
Biography = "Founder of Wintellect.",
},
Title = "CLR via C#",
PublishingDate = DateTime.Now,
};
var bookClient = redisClient.As<Book>();
bookClient.Store(book);
var book = bookClient.GetById(5);
}

8. • Session store
• Read cache, write-through cache
• Dynamically computed statistics and aggregates
• Publish/Subscribe channels

10. • 2x Redis Servers (master + slave)
• 96 GB RAM each
• 60k RPS on average
http://stackexchange.com/performance

11. using (var redisConnection = ConnectionMultiplexer.Connect("localhost"))
{
var redisDb = redisConnection.GetDatabase();
redisDb.ListLeftPush("people", "Alice");
redisDb.ListLeftPush("people", "Bob");
redisDb.ListRightPush("people", "Charlie");
var results = redisDb.ListRange("people", 0, redisDb.ListLength("people"));
foreach (var resultItem in results)
{
Console.WriteLine(resultItem);
}
}
1422544070.303526 [0 127.0.0.1:37586] "LPUSH" "people" "Alice"
1422544070.305371 [0 127.0.0.1:37586] "LPUSH" "people" "Bob"
1422544070.305891 [0 127.0.0.1:37586] "RPUSH" "people" "Charlie"
1422544070.306290 [0 127.0.0.1:37586] "LLEN" "people"
1422544070.309355 [0 127.0.0.1:37586] "LRANGE" "people" "0" "3"

12. • No “official” Windows port (only MSOpenTech x64 distro)
• Limited access control/administration features
• Non-ACID transactions (batching only)

13. yuriy.guts @ eleks.com