ticdc: add description about ticdc new architecture #19765
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Co-authored-by: Flowyi <[email protected]>
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| TiCDC 新架构由两个主要部分组成，分别是 Log Service 和 Downstream Adapter，其中 Log Service 负责拉取上游集群的行变更和 DDL 信息并存储在本地，Downstream Adapter 则根据用户创建的 Changefeed 信息产生相关的同步任务从 Log Service 拉取相关数据并同步到下游。 | ||
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| ### 核心组件 |
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建议不要把内部的模块写在用户文档上，因为这些东西用户并不关心，并且后续还有可能会改。可以考虑换成新架构的设计特点，可以考虑从这几个点：
- 描述将系统划分为 Log Service 和 Downstream Adapter 的原因和带来的好处
- Timer Drivent 和 Event Drivent 模型，提升并发度、执行效率和扩展能力，同时可以处理海量的表
- 代码结构优化，降低复杂度
| config: | ||
| newarch: true | ||
| ``` | ||
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| NOTE: 在使用 TiCDC 老架构时，请勿在配置文件中添加 `newarch` 配置项。`newarch` 仅用于新架构，不添加 `newarch` 配置项默认使用老架构。如果在 TiCDC 老架构的配置文件中添加 newarch，可能会导致解析失败。 | |
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| ### `newarch` | ||
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| - v9.0 版本引入，控制是否开启 TiCDC 新架构 | ||
| - 默认值：`false`，表示不开启 TiCDC 新架构 |
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| - 默认值：`false`，表示不开启 TiCDC 新架构 | |
| - 设置为 `true`，表示开启 TiCDC 新架构 | |
| - 不添加 `newarch` 配置项默认使用老架构。`newarch` 仅用于新架构，如果在 TiCDC 老架构的配置文件中添加 newarch，可能会导致解析失败。 |
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