How to solve high concurrency in php

PHP’s method to solve high concurrency

# #1. Separate applications and static resources

Put static resources (js, css, pictures, etc.) into a dedicated server.

2. Page caching

Caching the pages generated by the application can save a lot of CPU resources. For some pages that frequently change data, you can use ajax to process it.

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3. Cluster and distributed

Cluster, multiple servers have the same functions and mainly play the role of diversion. Distributed, putting different businesses on different servers. Multiple servers may be needed to process a request, thereby increasing the processing speed of a request. It is further divided into static resource cluster and application cluster. The latter is more complicated, and issues such as session synchronization often need to be considered.

4. Reverse proxy

The server that the client directly accesses is not the server that directly provides services. It obtains resources from other servers and then returns the results to user.

Proxy server and reverse proxy server:

The proxy server accesses resources on our behalf and then returns the results. For example, access the proxy server of the external network. The reverse proxy server is when we normally access a server, the server itself calls other servers.

We actively use the proxy server to serve us and do not need to have its own domain name; the reverse proxy is used by the server itself, and we do not know that it has its own domain name.

5. CDN

CDN is a special cluster page cache server. Compared with multiple page cache servers in an ordinary cluster, the main difference is: its storage Location and allocation requests work differently.

CDN servers are distributed across the country. After receiving a request, it will be assigned to the most appropriate CDN server node to obtain the data. Each of its CDN nodes is a page caching server.

Distribution method:

is not an ordinary load balancing, but a dedicated CDN domain name resolution server that allocates it when it resolves the domain name.

The general approach is: ISP uses CNAME to resolve the domain name to a specific domain name, and then uses a dedicated CDN server to resolve the resolved domain name (return to the browser, and then access it) to the corresponding domain name. CDN node. Each node may also be clustered with multiple servers.

You can know that the business logic for handling high concurrency is:

Front-end: Asynchronous request for resource static cdn

Back-end: Request queue polling Distribution load balancing shared cache

Data layer: redis cache data table write queue

Storage: raid array hot backup

Network: dns polling DDOS attack protection

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