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docs: docs for buffer type
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hunjixin committed Aug 2, 2024
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## 节点是被动接受数据还是主动拉取数据

被动接受: 实时性好,容易保证下游下游节点都获取到数据,不利于实现容量控制。
主动拉取: 容易实现流量控制, 实时性差,不容易保证所有下游节点都获取到数据。
主动拉取: 容易实现流量控制, 实时性差,不容易保证所有下游节点都获取到数据。

## 持久化缓存和内存缓存

持久化缓存可用性更好,内存缓存性能更好

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