1. A Developer overview ofRedis
Yuriy Guts
Solutions Architect @ ELEKS

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

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

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

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

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

7. Adoption

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

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

10. ServiceStack Typed Client
using (IRedisClient redisClient = new RedisClient())
{
var book = new Book()
{
Id = 5,
Author = new Author
{
Name = "Itzik Ben-­‐Gan",
Biography = "Microsoft MVP: SQL Server",
},
Title = "T-­‐SQL 2012 Fundamentals",
PublishingDate = DateTime.Now,
};
var bookClient = redisClient.As<Book>();
bookClient.Store(book);
var book = bookClient.GetById(5);
}

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

13. DEMO
• Leaderboard Server
• Leaderboard Command-Line Client
• Near-Realtime Leaderboard Web UI

14. Q & A
yuriy.guts @ eleks.com
https://github.com/YuriyGuts/redis-websocket-leaderboard