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Update 3.manage-snapshot.md (#1158) #1159

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Nov 3, 2021
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Update 3.manage-snapshot.md (#1158) #1159

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6 changes: 5 additions & 1 deletion docs-2.0/7.data-security/3.manage-snapshot.md
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Expand Up @@ -90,7 +90,7 @@ nebula> SHOW SNAPSHOTS;

当前未提供恢复快照命令，需要手动拷贝快照文件到对应的文件夹内，也可以通过shell脚本进行操作。实现逻辑如下：

1. 创建快照后，会在Meta服务器和Storage服务器的安装目录内生成`checkpoints`目录，保存创建的快照。以本文为例，当存在2个图空间时，创建的快照分别保存在`/usr/local/nebula/data/meta/nebula/0/checkpoints`、`/usr/local/nebula/data/storage/nebula/3/checkpoints`和`/usr/local/nebula/data/storage/nebula/4/checkpoints`中。
1. 创建快照后，会在leader Meta服务器和所有Storage服务器的安装目录内生成`checkpoints`目录，保存创建的快照。以本文为例，当存在2个图空间时，创建的快照分别保存在`/usr/local/nebula/data/meta/nebula/0/checkpoints`、`/usr/local/nebula/data/storage/nebula/3/checkpoints`和`/usr/local/nebula/data/storage/nebula/4/checkpoints`中。

```bash
$ ls /usr/local/nebula/data/meta/nebula/0/checkpoints/
Expand All @@ -103,6 +103,10 @@ nebula> SHOW SNAPSHOTS;

2. 当数据丢失需要通过快照恢复时，用户可以找到合适的时间点快照，将内部的文件夹`data`和`wal`分别拷贝到各自的上级目录（和`checkpoints`平级），覆盖之前的`data`和`wal`，然后重启集群即可。

!!! caution

需要同时覆盖所有Meta节点的data和wal目录，因为存在重启集群后发生Meta重新选举leader的情况，如果不覆盖所有Meta节点，新的leader使用的还是最新的Meta数据，导致恢复失败。


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