清理回收站和恢复数据

查看文件块数命令:hdfs fsck / -blocks

HDFS垃圾回收站, 默认是0，单位是分钟，实验设置为1天即1440.

core-site.xml

  <property>

        <name>fs.trash.interval</name>

        <value>1440</value>

  </property>

 

在线上把垃圾回收站的时间调大到7天

定时执行脚本，shell开发删除回收站

清理垃圾回收站:

hdfs dfs -ls /user/root/.Trash
hdfs dfs -rm -r /user/root/.Trash/190815070000

 

恢复数据:

实验:

#删除一个文件夹

[root@oldboy-node101 ~]# hdfs dfs -rm -r /tmp/logs/root/logs/logs

19/06/17 20:29:08 INFO fs.TrashPolicyDefault: Namenode trash configuration: Deletion interval = 1440 minutes, Emptier interval = 0 minutes.

Moved: 'hdfs://oldboy-node101:9000/tmp/logs/root/logs/logs' to trash at: hdfs://oldboy-node101:9000/user/root/.Trash/Current

#查看是否已经在回收站

[root@oldboy-node101 ~]# hdfs dfs -ls /user/root/.Trash/Current/tmp/logs/root/logs

Found 1 items

drwx------   - root supergroup          0 2019-06-17 19:34 /user/root/.Trash/Current/tmp/logs/root/logs/logs

#恢复,移动回原位置即可

hdfs dfs -mv /user/root/.Trash/Current/tmp/logs/root/logs  /tmp/logs/root/logs

#手动永久删除

hdfs dfs -rm -r /user/root/.Trash/Current/tmp/logs/root/logs/logs