Implementing Redis cluster using ThinkPHP6

With the rapid development of the Internet, the problem of high concurrency has become more and more prominent. In response to this problem, the emergence of Redis has become an important solution. It solves the problem of excessive reading and writing pressure in traditional relational databases through memory reading and writing. However, single-node Redis still has performance bottlenecks under high concurrency conditions, so Redis clusters need to be used.

This article will describe how to use ThinkPHP6 to implement a Redis cluster.

1. Introduction to Redis Cluster

Redis cluster is a distributed solution officially provided by Redis. It divides data into multiple nodes for storage and processing, thereby improving the availability and performance of Redis. . Redis cluster uses a centerless architecture, each node has the same role, and each node communicates through the Gossip protocol.

Redis cluster usually requires at least three nodes, one of which serves as the control node of the cluster and the other nodes serve as data nodes. If the control node fails, the system can perform automatic failover. To ensure system availability and data integrity, data is replicated on each node, and the cluster must have an odd number of nodes.

2. Integration of ThinkPHP6 and Redis cluster

1. Install Redis extension

ThinkPHP6 uses the Redis extension of PHP to access Redis, so before starting, you first need to Install the Redis extension. You can use the following command to install:

pecl install redis

2. Install Redis cluster

Redis cluster can be installed through the official script. For specific steps, please refer to the official document https://redis.io/topics /cluster-tutorial .

3. Modify the configuration file

In the configuration file config/cache.php of ThinkPHP6, you can set the connection information of the Redis cluster. For example:

'redis'     =>  [
    'type'  =>  'redis',
    'host'  =>  '127.0.0.1',
    'port'  =>  6379,
    'password'  =>  '',
    'select'    =>  0,
    'timeout'   =>  0,
    'persistent'=>  true,
    'cluster'   =>  true,
],

Among them, the cluster option indicates using Redis cluster.

4. Using Redis cluster

The operation methods of using Redis cluster and single-node Redis in the program are basically the same. For example:

// 获取值
$value = Cache::store('redis')->get('key');

// 设置值，过期时间60秒
Cache::store('redis')->set('key', 'value', 60);

// 删除值
Cache::store('redis')->delete('key');

// 清空所有缓存
Cache::clear();

3. Precautions for using Redis cluster

1. The number of nodes must be an odd number

The number of nodes in the Redis cluster must be an odd number, because the cluster needs to elect One master node and several slave nodes. If the number of nodes is an even number, it may cause problems in the election.

2. Cluster data inconsistency problem

Because the Redis cluster uses asynchronous replication, there are data inconsistencies. For example, after writing data, reading it immediately may not be able to read the data, and you need to wait for a while. Therefore, you should pay attention to this issue during code development.

3. Node failover problem

The Redis cluster performs failover through the election mechanism. If the control node hangs up, automatic failover is required. However, during the failover process, data inconsistency may occur, which requires appropriate handling measures.

4. Summary

Redis cluster is a high-availability, high-performance Redis solution that can be easily integrated using ThinkPHP6. When using Redis cluster, you need to pay attention to issues such as the number of nodes must be an odd number, cluster data inconsistency and node failover issues.

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