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Redis Overview

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Hoang Long
Hoang Long

This document provides an overview of Redis, including its creation, features, and persistence methods. Redis is an open-source, in-memory key-value store that was created by Salvatore Sanfilippo to solve the problem of storing real-time page view data from multiple websites. It features different data types that can be stored as keys, master-slave replication for availability, and two persistence methods: RDB, which takes periodic snapshots of the dataset, and AOF, which logs all write operations to reconstruct the dataset from disk on startup.

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REDIS OVERVIEW Dinh Hoang Long Framgia, Inc.
2 Outline ● NoSQL and Redis ● The Creation of Redis ● Redis Features ● Redis Persistence
3 NoSQL ● Non-relational ● Distributed ● Open-source ● Horizontally scalable
4 Redis Key Value Store NoSQL DBMS
5 The Creation of Redis
6 The Creation of Redis The story of Salvatore Sanfilippo (antirez) Creator of Redis
7 Business ● Receiving a stream of page views from multiple websites. ● Storing the latest n page views for every site ● Show latest page views in real time to users ● Maintaining history
8 Problem With a peak load of a few thousand page views per second ● Whatever the database schema was ● Whatever trade-offs is → No way for storing by SQL
9 The Creation of Redis Solution ● In-memory data store ● Storing lists as a native data type ● Implementing using C language ● Adding fork-based persistence feature
10 The Creation of Redis Solution ● In-memory data store ● Storing lists as a native data type ● Implementing using C language ● Adding fork-based persistence feature → Finally, Redis was born!
11 Redis Features ● Data Model ● Master/Slave Replication ● In-memory
12 Data Model ● STRING
13 Data Model ● STRING ● LIST
14 Data Model ● STRING ● LIST ● SET
15 Data Model ● STRING ● LIST ● SET ● HASH
16 Data Model ● STRING ● LIST ● SET ● HASH ● ZSET (Sorted Set)
17 Master/Slave Replication Source: http://harish11g.blogspot.com
18 In-memory FAST
19 What happened if server is turned off?
20 Redis Persistence
21 Redis Persistence Storing data in hard disk ● RDB (Redis Database) ● AOF (Append Only File)
22 RDB (Redis Database)
23 RDB (Redis Database) Point-in-time snapshots of dataset at specified intervals.
24 RDB (Redis Database) Advantages ● Perfect for backup and transfer ● Maximum performance - Child process: Persist on disk - Parent process: No I/O
25 RDB (Redis Database) Disadvantages ● Cannot minimize the chance of data loss ● fork() can be time consuming if the dataset is big
26 AOF (Append Only File)
27 AOF (Append Only File) ● Logs every write operation received by the server ● Plays again operation at server startup to reconstruct the original dataset
28 AOF (Append Only File) Advantages ● Durability (sync every second, every query) ● No seek is required ● Automatically rewrite AOF in background when it gets too big
29 AOF (Append Only File) Disadvantages ● Files are usually bigger than RDB files. ● Can be slower than RDB ● Rare bugs in specific commands
30 What should we use?
31 References TỔNG QUAN VỀ REDIS http://tech.blog.framgia.com/vn/?p=3365 @dinhhoanglong91
32 Thank for watching!

More Related Content

Redis Overview

  • 1. REDIS OVERVIEW Dinh Hoang Long Framgia, Inc.
  • 2. 2 Outline ● NoSQL and Redis ● The Creation of Redis ● Redis Features ● Redis Persistence
  • 3. 3 NoSQL ● Non-relational ● Distributed ● Open-source ● Horizontally scalable
  • 4. 4 Redis Key Value Store NoSQL DBMS
  • 5. 5 The Creation of Redis
  • 6. 6 The Creation of Redis The story of Salvatore Sanfilippo (antirez) Creator of Redis
  • 7. 7 Business ● Receiving a stream of page views from multiple websites. ● Storing the latest n page views for every site ● Show latest page views in real time to users ● Maintaining history
  • 8. 8 Problem With a peak load of a few thousand page views per second ● Whatever the database schema was ● Whatever trade-offs is → No way for storing by SQL
  • 9. 9 The Creation of Redis Solution ● In-memory data store ● Storing lists as a native data type ● Implementing using C language ● Adding fork-based persistence feature
  • 10. 10 The Creation of Redis Solution ● In-memory data store ● Storing lists as a native data type ● Implementing using C language ● Adding fork-based persistence feature → Finally, Redis was born!
  • 11. 11 Redis Features ● Data Model ● Master/Slave Replication ● In-memory
  • 12. 12 Data Model ● STRING
  • 13. 13 Data Model ● STRING ● LIST
  • 14. 14 Data Model ● STRING ● LIST ● SET
  • 15. 15 Data Model ● STRING ● LIST ● SET ● HASH
  • 16. 16 Data Model ● STRING ● LIST ● SET ● HASH ● ZSET (Sorted Set)
  • 17. 17 Master/Slave Replication Source: http://harish11g.blogspot.com
  • 19. 19 What happened if server is turned off?
  • 21. 21 Redis Persistence Storing data in hard disk ● RDB (Redis Database) ● AOF (Append Only File)
  • 22. 22 RDB (Redis Database)
  • 23. 23 RDB (Redis Database) Point-in-time snapshots of dataset at specified intervals.
  • 24. 24 RDB (Redis Database) Advantages ● Perfect for backup and transfer ● Maximum performance - Child process: Persist on disk - Parent process: No I/O
  • 25. 25 RDB (Redis Database) Disadvantages ● Cannot minimize the chance of data loss ● fork() can be time consuming if the dataset is big
  • 26. 26 AOF (Append Only File)
  • 27. 27 AOF (Append Only File) ● Logs every write operation received by the server ● Plays again operation at server startup to reconstruct the original dataset
  • 28. 28 AOF (Append Only File) Advantages ● Durability (sync every second, every query) ● No seek is required ● Automatically rewrite AOF in background when it gets too big
  • 29. 29 AOF (Append Only File) Disadvantages ● Files are usually bigger than RDB files. ● Can be slower than RDB ● Rare bugs in specific commands
  • 30. 30 What should we use?
  • 31. 31 References TỔNG QUAN VỀ REDIS http://tech.blog.framgia.com/vn/?p=3365 @dinhhoanglong91
  • 32. 32 Thank for watching!