E-commerce site comparison of commonly used cache policy framework, e-commerce site Architecture _php Tutorial

E-commerce site comparison of commonly used cache policy framework, e-commerce site architecture

Cache is an important component in distributed system, which mainly solves the performance problem of hot data access in high concurrency and big data scenarios. Provides fast, high-performance data access.

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Cache is an important component in distributed system, which mainly solves the performance problem of hot data access in high concurrency and big data scenarios. Provides fast, high-performance data access.

The principle of caching

(1) Data write/read faster storage (device);

(2) cache the data to the nearest location of the application;

(3) cache the data to the nearest user location.

Cache classification

In distributed systems, the application of caching is very extensive, from the deployment perspective there are several aspects of the cache application.

(1) CDN Cache;

(2) reverse proxy cache;

(3) distributed cache;

(4) local application cache;

Cache Media

Common middleware: Varnish,ngnix,squid,memcache,redis,ehcache, etc.;

Cached content: Files, data, objects;

Cached media: CPU, Memory (local, distributed), disk (local, distributed)

Cache design

The caching design needs to address several issues:

(1) What is cached?

Which data needs to be cached: 1. Hot data; 2. static resources;

(2) Where is the cache?

CDN, reverse proxy, distributed cache server, native (memory, hard disk)

(3) How to cache the problem?

• Expiration policy

1. Fixed time: For example, specify the cache time is 30 minutes;

2. Relative time: such as data not accessed in the last 10 minutes;

• Synchronization mechanism

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