[improvement](ccr) improve overview of ccr #1427
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| ### CCR 是什么 | ||
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| CCR(Cross Cluster Replication) 是跨集群数据同步，能够在库/表级别将源集群的数据变更同步到目标集群，可用于在线服务的数据可用性、隔离在离线负载、建设两地三中心。 | ||
| CCR (Cross Cluster Replication) 是一种跨集群数据同步机制，能够在库或表级别将源集群的数据变更同步到目标集群。它主要用于提升在线服务的数据可用性、支持离线负载隔离和建设两地三中心架构。 |
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| - 容灾备份：通常是将企业的数据备份到另一个集群与机房中，当突发事件导致业务中断或丢失时，可以从备份中恢复数据或快速进行主备切换。一般在对 SLA 要求比较高的场景中，都需要进行容灾备份，比如在金融、医疗、电子商务等领域中比较常见。 | ||
| - **读写分离**：通过将数据的查询操作与写入操作分离，减小读写之间的相互影响，提高资源利用率。对于高并发或写入压力大的场景，采用读写分离可以有效分散负载，提升数据库性能和稳定性。 |
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| syncer：一个轻量级的进程 | ||
| CCR 主要依赖一个轻量级进程：`Syncers`。`Syncers` 负责从源集群获取 binlog，并将元数据应用到目标集群，通知目标集群从源集群拉取数据，从而实现全量同步和增量同步。 |
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dataroaring
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