53e0065e3e
配置 SSOT（TOML + .env） 统一错误契约 Auth 与事务边界 Redis / Celery 可靠性:业务 Redis（DB/0）与 Celery broker/backend（DB/1）显式拆分；连接池、sync client 可观测性（OpenTelemetry + LGTM）
72 lines
2.1 KiB
Markdown
72 lines
2.1 KiB
Markdown
---
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title: Use Connection Pooling or Multiplexing
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impact: HIGH
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impactDescription: Reduces connection overhead by 10x or more
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tags: connections, pooling, multiplexing, performance
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description: Use Connection Pooling or Multiplexing
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alwaysApply: true
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---
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## Use Connection Pooling or Multiplexing
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Reuse connections via a pool or multiplexing instead of creating new connections per request.
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**Correct:** Use a connection pool.
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**Python** (redis-py):
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```python
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import redis
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# Good: Connection pool - reuses existing connections
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pool = redis.ConnectionPool(host='localhost', port=6379, max_connections=50)
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r = redis.Redis(connection_pool=pool)
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```
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**Java** (Jedis):
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```java
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import redis.clients.jedis.JedisPooled;
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// JedisPooled manages a connection pool internally
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try (JedisPooled jedis = new JedisPooled("redis://localhost:6379")) {
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jedis.set("testKey", "testValue");
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}
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```
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**Correct:** Use multiplexing (Lettuce, NRedisStack).
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```java
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// Lettuce uses multiplexing by default - single connection handles all traffic
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RedisClient client = RedisClient.create("redis://localhost:6379");
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StatefulRedisConnection<String, String> connection = client.connect();
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// All commands share the single connection efficiently
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connection.sync().set("key", "value");
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```
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**Incorrect:** Creating new connections per request.
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**Python** (redis-py):
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```python
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# Bad: New connection every time
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def get_user(user_id):
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r = redis.Redis(host='localhost', port=6379) # Don't do this
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return r.get(f"user:{user_id}")
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```
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**Java** (Jedis):
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```java
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// Bad: Creating new client per request
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public String getUser(String userId) {
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try (UnifiedJedis jedis = new UnifiedJedis("redis://localhost:6379")) {
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return jedis.get("user:" + userId); // Don't do this
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}
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}
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```
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**Pooling vs Multiplexing:**
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- **Pooling**: Multiple connections shared across requests (redis-py, Jedis, go-redis)
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- **Multiplexing**: Single connection handles all traffic (NRedisStack, Lettuce)
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- Multiplexing cannot support blocking commands (BLPOP, etc.) as they would stall all callers
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Reference: [Connection Pools and Multiplexing](https://redis.io/docs/latest/develop/clients/pools-and-muxing/)
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