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Update replication-between-clusters.md #1633

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Apr 6, 2022
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Update replication-between-clusters.md #1633

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Update replication-between-clusters.md
cooper-lzy Apr 6, 2022
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Update replication-between-clusters.md
cooper-lzy Apr 6, 2022
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6 changes: 3 additions & 3 deletions docs-2.0/synchronization-and-migration/replication-between-clusters.md
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Expand Up @@ -327,9 +327,9 @@ drainer：机器 IP 地址为`192.168.10.104`，只启动 drainer 服务。

## 常见问题

### 主集群中已经有一部分存量数据了，从集群可以同步到之前的存量数据吗？
### 主集群中已经有 data 了，从集群可以同步到之前的存量 data 吗？

可以。drainer 接收到 listener 的 WAL 后，会发现从集群中没有对应的数据，然后会从 listener 中拉取全量数据并覆盖到从集群中的相应分片。
可以。对于主集群中的存量 data，主集群的 listener 会从各个分片的 leader 节点拉取快照，然后以 WAL 的形式发送给 drainer。存量 data 相关的 WAL 发送完毕后，开始发送主集群的增量 data 相关的 WAL 给 drainer。

### 从集群中已经有 data 了，数据同步会有影响吗？

Expand All @@ -345,7 +345,7 @@ drainer：机器 IP 地址为`192.168.10.104`，只启动 drainer 服务。

### 主从集群的机器数量、副本数量、分片数量需要相同吗？

不需要。因为是以图空间为基本单位，主集群不需要知道从集群的架构信息，只需要将 WAL 发送给 listener 即可。
不需要。因为是以图空间为基本单位，主集群不需要知道从集群的架构信息，只需要 listener 将 WAL 发送给 drainer 即可。

### 如果同步时出现故障，如何修复？

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