Redis 101
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Redis is an 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, and more. Redis has features like replication, Lua scripting, different persistence methods, and high availability options. It can store basic types like strings, lists, hashes and sets, along with common operations on each type. Redis also supports message brokering, transactions, pipelining, caching, and atomic counters. It can be administered through configuration files, commands, and has persistence, high availability, scaling, and scripting capabilities.
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Philipp Reisner is one of the founders and CEO of LINBIT in Vienna/Austria. He holds a Dipl.-Ing. (comparable to MSc) degree in computer science from Technical University in Vienna. His professional career has been dominated by developing DRBD, a storage replication software for Linux. While in the early years (2001) this was writing kernel code, today he leads a company of 30 employees with locations in Austria and the USA. LINBIT is an Open Source company offering enterprise-level support subscriptions for its Open Source technologies.
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- 1. Redis 101 - Abhishek Parwal
- 2. What is Redis? Remote Dictionary Server Redis is an open source (BSD licensed), in-memory data structure store, used as a database, cache and message broker. It supports data structures such as strings, hashes, lists, sets, sorted sets with range queries, bitmaps, hyperloglogs and geospatial indexes with radius queries. Redis has built-in replication, Lua scripting, LRU eviction, transactions and different levels of on-disk persistence, and provides high availability via Redis Sentinel and automatic partitioning with Redis Cluster.
- 4. Basic DS & Operations ● String ○ SET, GET, APPEND, INCRBY, GETRANGE, DEL ... ○ MSET - bulk set ● Lists ○ LPUSH, RPUSH, LPOP, LSET, LLEN, LTRIM ... ● Sets ○ SADD, SCARD, SDIFF, SINTER, SMEMBERS, SREM … ● Hashes ○ HSET, HMSET, HGET, HGETALL, HKEYS, HVALS, HDEL … ● Sorted Sets ○ ZADD, ZRANGE, ZREM ○ WITHSCORES
- 5. Basic Operations ● Message Broker ○ PUBLISH, SUBSCRIBE ● Transactions ○ MULTI , EXEC ○ WATCH - locks ○ Operations queued ● Pipeline ○ Execute a batch ● Atomic counters ○ INCR, INCRBY ○ Redis server: single threaded. Clients can cause Race if GET,SET
- 6. Basic Operations ● Cache ○ EXPIRE ○ LRU - set eviction policy
- 7. Administration ● Configuration: In order of priority ○ redis.conf ○ Command line ○ Redis Commands: CONFIG SET <config> <value> ● Authentication ○ Password: requirepass <passwd> , AUTH <passwd> ○ Commands Rename ● Persistence ○ RDB: snapshots , async ■ Data saved periodically ○ AOF: append only file, sync. ■ not recommended alone, replays the command - prone to error.
- 8. Administration ● INFO : memory, clients, stats, settings of Server ● KEYS <regex> ● Database: 0-16 ○ SELECT <dbno> ● MONITOR ● Logging ○ logfile ○ Slowlog : log slow queries by x microseconds(us)
- 9. HA, Scaling ● Replication - master / slaves ○ SLAVEOF ○ Slaves - generally read only ○ Enables Scaling and Availability ● Scaling ○ Client based sharding ■ Range based sharding ● Need to know the data ranges ■ Hash based sharding ● Even balancing ○ Redis cluster ■ cluster-enabled, redis-trib.rb
- 10. HA, Scaling ● High Availability ○ Redis Sentinel ■ Monitoring ■ Auto failover : slave promotion to master
- 11. Scripting ● Lua ○ Interpreted language ○ Basic data types: ■ Numbers, nil, bool, string, tables ○ Conditional: if ,elseif, else OR and or ○ Loop - while end, repeat until , for do end ○ Functions ● Redis ○ EVAL ■ redis.call(‘GET’, KEYS[1]) ○ SCRIPT LOAD - cache the script on server, FLUSH ■ EVALSHA ■ CPU vs Network tradeoff
- 12. Thanks !