This is redis - feature and usecase
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This document provides an overview of Redis, including: - Redis is an in-memory database that supports various data types and persistence. It can function as a cache but is not solely a cache. - Redis has very fast performance and supports features like expiration, different data types (strings, hashes, lists, sets, sorted sets), replication, and sharding. - The document discusses Redis use cases, installation, benchmarking results, commands, and provides examples of how Redis could be used for tasks like tracking page views, popular news lists, and real-time gaming rankings.
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This is redis - feature and usecase
- 1. This is REDIS - Feature and USECASE
- 2. About Me Kris jeong(정경석) Author a Book of REDIS ‘This is REDIS’ in korean Software development Over 14 years. Web service dev. Messaging server dev. Recommendation dev. Interested about NoSQL http://www.aladin.co.kr/shop/wproduct.aspx?ISBN=8968480591
- 3. What is REDIS is In-Memory Database Variety data types Support persistence Key value based NoSQL
- 4. IMDB(In-Memory DB) Disk based data store In-Memory data store Query Engine Query Engine Speed Storage Manager Memory(Cache) Disk Memory Durability Disk is optional Disk
- 5. Redis is cache server? Not a cache server. But, It can be. Turn off Persistence.
- 7. Install and test $ wget http://download.redis.io/redis-stable.tar.gz $ tar xvf redis-stable.tar.gz $ cd redis-stable $ make … … done. $ make test ※ CentOS 6.4 64bit
- 8. Feature
- 9. Super fast (TPS) $ ./src/redis-benchmark --csv -d 1024 "PING_INLINE","34602.07" "PING_BULK","35971.22" "SET","35211.27" "GET","31347.96" … "LPUSH (needed to benchmark LRANGE)","32467.53" "LRANGE_100 (first 100 elements)","4714.76" "LRANGE_300 (first 300 elements)","1605.91" "LRANGE_500 (first 450 elements)","1030.93" "LRANGE_600 (first 600 elements)","735.13" "MSET (10 keys)","22471.91" ※ CentOS 6.4 64bit, Core i5 3337U@1.8Gz
- 10. Feature - expire Duration cache expire user:212:cart 259200 seconds It will be expired 3 days later. Specified time cache expireat user:212:item:sward 1388534400 It will be expired 2014/01/01 Unix timestamp
- 11. Support data types String key value { "product": { "id": "2951", "name": "testing 01", "options": { "color": "red" }, "quantity": 4 } user:1:cart_info } ※ Up to 512MB
- 12. Support data types (cont.) Hash Key field value name min damage 13 max damage 20 durability 32/50 price item:1:info bastard sword 3500 add a new value durability 31/50
- 13. Support data types (cont.) Hash Key field value name min damage item:1:info bastard sword 13 max damage 20 durability 31/50 32/50 price 3500
- 14. Support data types (cont.) List Key user:1:messag e elements hi~ how r you. bye. add a new value
- 15. Support data types (cont.) List Key user:1:messag e elements hi~ how r you. bye.
- 16. Support data types (cont.) Set kris mike frank user:1:friend martin tom add a new value chris
- 17. Support data types (cont.) Set kris mike user:1:friend frank martin tom chris
- 18. Support data types (cont.) Sorted Set score Key value 1 91 mike 200 frank 250 martin 251 user:ranking kris tom add a new value 220 chris
- 19. Support data types (cont.) Sorted Set Key score value 1 91 user:ranking kris mike 200 frank 220 250 chris martin 250 251 martin tom 251 tom
- 20. Feature – RDB(Snapshot) Redis instance Redis data Data dump to disk Dump file (Redis.rdb) When snapshot event raised Check point of Redis snapshot Redis data size vs Physical memory size ratio vm.overcommit_memory setting Disk I/O rate for swap
- 21. Feature – AOF(Append Only File) Redis instance Command logging Redis data Data change command Redis client Check point of Redis aof Disk space Restart time is slower than RDB appendonly.aof
- 22. Replication – Single slave Redis cluster Master Node Slave Node Replication key1 test value set key1 ‘test value’ key1 set key1 ‘test value’ Redis client test value
- 23. Replication – Multiple slave Redis cluster Slave Node 1 Replication Master Node Slave Node 2 Slave Node 3 Read Write Redis client
- 24. Replication – Multiple slave (cont.) Redis cluster 1st Replication Master Node Slave Node 1 2nd Replication Slave Node 2 Slave Node 3 Write Redis client Slave Node 4 Read Redis client
- 25. Sharding – range ● Data range based data split User Key 1 ~ 100 User Key 1~50 User Key 51~100 Shard 1 Shard 2 Master Node Master Node Slave Node Slave Node Slave Node Slave Node
- 26. Sharding - vertical ● Schema based data split User info Content Shard 1 Shard 2 Master Node Master Node Slave Node Slave Node Slave Node Slave Node
- 27. Sharding - consistent hashing ● Key based data split User Key 1 ~ 100 Key % Number of Shard(Key % 2) Shard 1 Shard 2 Master Node Master Node Slave Node Slave Node Slave Node Slave Node
- 28. Sharding – Redis client Shard 1 Shard N … Sharding Calc Read/Write Read/Write Redis client Check point of Redis Sharding Redis does not support server-side sharding Most Redis client support hash based sharding Re sharding issue
- 29. Useage PV/UV Calculation 1Billion user Daily logged in user count Weekly logged in user count List of Logged-in account at least once of week Most popular News list - Real time Top 10 of news by click count News list by popular by comment count Real time gamers ranking Score based Top 10 ranker. Recent user list
- 30. Demo