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when deleting a space, the snapshot of the space is also deleted #2460

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Jan 11, 2023
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when deleting a space, the snapshot of the space is also deleted #2460

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when deleting a space, the snapshot of the space is also deleted
abby-cyber Jan 9, 2023
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add note for drop space
abby-cyber Jan 9, 2023
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Update 5.drop-space.md
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6 changes: 5 additions & 1 deletion docs-2.0/3.ngql-guide/9.space-statements/5.drop-space.md
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Expand Up @@ -4,7 +4,11 @@

!!! note

`DROP SPACE`是否删除图空间对应的硬盘数据由 Storage 配置参数 auto_remove_invalid_space 决定。auto_remove_invalid_space 的默认值为`true`，表示会删除数据。如需在删除逻辑图空间时保留硬盘数据，将 auto_remove_invalid_space 的值修改为`false`。详情参见 [Storage 服务配置](../../5.configurations-and-logs/1.configurations/4.storage-config.md)。
`DROP SPACE`是否删除图空间对应的硬盘数据由 Storage 配置参数`auto_remove_invalid_space`决定。`auto_remove_invalid_space`的默认值为`true`，表示会删除数据。如需在删除逻辑图空间时保留硬盘数据，将`auto_remove_invalid_space`的值修改为`false`。详情参见 [Storage 服务配置](../../5.configurations-and-logs/1.configurations/4.storage-config.md)。

!!! warning

执行`DROP SPACE`后，即使快照中存在该图空间的数据，该图空间的数据也无法恢复。当`auto_remove_invalid_space`的值为`false`时，不会出现此种情况。

## 前提条件

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5 changes: 4 additions & 1 deletion docs-2.0/backup-and-restore/3.manage-snapshot.md
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Expand Up @@ -85,9 +85,12 @@ nebula> SHOW SNAPSHOTS;
| "SNAPSHOT_2021_03_09_09_10_52" | "VALID" | "127.0.0.1:9779" |
+--------------------------------+---------+------------------+
```

## 恢复快照

!!! warning

恢复快照数据时，如果快照中备份的图空间被删除（执行了`DROP SPACE`操作），那么该图空间数据将无法恢复。

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 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。
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