编辑“︁HDFS快照管理”︁（章节）

== 基本操作 ==

=== 启用快照功能 ===
首先需在目标目录上启用快照功能：
<syntaxhighlight lang="bash">
# 为目录启用快照（需管理员权限）
hdfs dfsadmin -allowSnapshot /user/data/important
</syntaxhighlight>

=== 创建快照 ===
<syntaxhighlight lang="bash">
# 创建命名快照
hdfs dfs -createSnapshot /user/data/important backup_20230801
Created snapshot /user/data/important/.snapshot/backup_20230801
</syntaxhighlight>

=== 查看快照 ===
<syntaxhighlight lang="bash">
# 列出所有快照
hdfs ls /user/data/important/.snapshot
Found 3 items
drwxr-xr-x - hadoop supergroup 0 2023-08-01 12:00 backup_20230801
drwxr-xr-x - hadoop supergroup 0 2023-07-15 09:30 monthly_bak
</syntaxhighlight>

=== 恢复快照 ===
<syntaxhighlight lang="bash">
# 从快照恢复单个文件
hdfs dfs -cp /user/data/important/.snapshot/backup_20230801/config.xml /user/data/important/
</syntaxhighlight>

=== 删除快照 ===
<syntaxhighlight lang="bash">
hdfs dfs -deleteSnapshot /user/data/important backup_20230801
</syntaxhighlight>