参考:
http://my.oschina.net/cloudcoder/blog/179381
http://www.linuxidc.com/Linux/2012-02/55102.htm
http://www.linuxidc.com/Linux/2012-02/55102.htm
查看CDH 的hdfs的配置,是否开启trash 及 保留时间:
测试:
点击(此处)折叠或打开
- 1.创建test.txt
- [root@sht-sgmhadoopnn-01 ~]# vi /tmp/test.txt
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- 2.创建文件夹
- [root@sht-sgmhadoopnn-01 ~]# hadoop fs -mkdir /testdir
- You have new mail in /var/spool/mail/root
- [root@sht-sgmhadoopnn-01 ~]# hadoop fs -ls /
- Found 4 items
- drwxr-xr-x - hdfs supergroup 0 2016-02-04 00:38 /system
- drwxr-xr-x - root supergroup 0 2016-02-19 08:17 /testdir
- drwxrwxrwt - hdfs supergroup 0 2016-02-10 16:04 /tmp
- drwxr-xr-x - hdfs supergroup 0 2016-02-10 16:02 /user
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- 3.put 文件到hadoop
- [root@sht-sgmhadoopnn-01 ~]# hadoop fs -put /tmp/test.txt /testdir
- [root@sht-sgmhadoopnn-01 ~]# hadoop fs -ls /testdir
- Found 1 items
- -rw-r--r-- 3 root supergroup 10 2016-02-19 08:18 /testdir/test.txt
- [root@sht-sgmhadoopnn-01 ~]# hadoop fs -cat /testdir/test.txt
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- You have mail in /var/spool/mail/root
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- 4.删除文件夹testdir
- [root@sht-sgmhadoopnn-01 ~]# hadoop fs -rm -r /testdir
- 16/02/19 08:27:05 INFO fs.TrashPolicyDefault: Namenode trash configuration: Deletion interval = 1440 minutes, Emptier interval = 0 minutes.
- Moved: 'hdfs://sgm-nameservice/testdir' to trash at: hdfs://sgm-nameservice/user/root/.Trash/Current
- [root@sht-sgmhadoopnn-01 ~]# hadoop fs -ls /
- Found 3 items
- drwxr-xr-x - hdfs supergroup 0 2016-02-04 00:38 /system
- drwxrwxrwt - hdfs supergroup 0 2016-02-10 16:04 /tmp
- drwxr-xr-x - hdfs supergroup 0 2016-02-10 16:02 /user
- You have mail in /var/spool/mail/root
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- 5.查看回收站
- [root@sht-sgmhadoopnn-01 ~]# hadoop fs -ls /user/root/.Trash/Current
- Found 1 items
- drwxr-xr-x - root supergroup 0 2016-02-19 08:18 /user/root/.Trash/Current/testdir
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- 6.恢复文件夹
- [root@sht-sgmhadoopnn-01 ~]# hadoop fs -mv /user/root/.Trash/Current/testdir /
- [root@sht-sgmhadoopnn-01 ~]# hadoop fs -ls /
- Found 4 items
- drwxr-xr-x - hdfs supergroup 0 2016-02-04 00:38 /system
- drwxr-xr-x - root supergroup 0 2016-02-19 08:17 /testdir
- drwxrwxrwt - hdfs supergroup 0 2016-02-10 16:04 /tmp
- drwxr-xr-x - hdfs supergroup 0 2016-02-10 16:02 /user
- [root@sht-sgmhadoopnn-01 ~]# hadoop fs -cat /testdir/test.txt
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