Hadoop 回收站的trash 默认是 关闭的， 你只要在 conf/core-site.xml 里面开启就可以了 View Code PHP ? hadoop.tmp.dir /usr/hadoop/tmp A base for other temporary directories.? fs.default.name hdfs://192.168.1.192:9000?!--下面的代码就是开启hadoop
Hadoop 回收站的trash 默认是 关闭的， 你只要在 conf/core-site.xml 里面开启就可以了
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?
hadoop.tmp.dir
/usr/hadoop/tmp
A base for other temporary directories.
?
fs.default.name
hdfs://192.168.1.192:9000
?
<!--下面的代码就是开启hadoop的回收站trash功能-->
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fs.trash.interval
1440
Number of minutes between trash checkpoints.
If zero, the trash feature is disabled.
?
<!--trash 配置结束-->1440 是设置回收站保存的时间， 单位分钟 这里我设置一天:1440 = 60*24
2、测试回收站功能
看下我dfs 下面的文件
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[hadoop@master conf]$ hadoop fs -ls Found 3 items drwxr-xr-x - hadoop supergroup 0 2013-01-13 17:00 /user/hadoop/.Trash drwxr-xr-x - hadoop supergroup 0 2013-01-10 21:02 /user/hadoop/intoday drwxr-xr-x - hadoop supergroup 0 2013-01-10 21:03 /user/hadoop/outtoday [hadoop@master conf]$ hadoop fs -ls intoday Found 2 items -rw-r--r-- 1 hadoop supergroup 2 2013-01-10 21:02 /user/hadoop/intoday/file1.txt -rw-r--r-- 1 hadoop supergroup 2 2013-01-10 21:02 /user/hadoop/intoday/file2.txt [hadoop@master conf]$
可以看到indoday 里面有file1.txt 跟file2.txt, 下面把intoday 这个目录删除
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[hadoop@master conf]$ hadoop fs -rmr intoday Moved to trash: hdfs://192.168.1.192:9000/user/hadoop/intoday [hadoop@master conf]$
提示Moved to trash ，说明文件已经删除到回收站了
看看回收站里面有没有
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[hadoop@master conf]$ hadoop fs -ls Found 2 items drwxr-xr-x - hadoop supergroup 0 2013-01-13 17:10 /user/hadoop/.Trash drwxr-xr-x - hadoop supergroup 0 2013-01-10 21:03 /user/hadoop/outtoday [hadoop@master conf]$ hadoop fs -ls /user/hadoop/.Trash Found 2 items drwxr-xr-x - hadoop supergroup 0 2013-01-13 16:45 /user/hadoop/.Trash/1301131700 drwxr-xr-x - hadoop supergroup 0 2013-01-13 17:10 /user/hadoop/.Trash/Current //这个文件就是回收站里面的文件 ， 你可以用 -ls 具体查看
3 删除了当然要回复，下面恢复下回收站的文件
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[hadoop@master conf]$ hadoop fs -mv .Trash/Current/user/hadoop/intoday intoday [hadoop@master conf]$ hadoop fs -ls Found 3 items drwxr-xr-x - hadoop supergroup 0 2013-01-13 17:10 /user/hadoop/.Trash drwxr-xr-x - hadoop supergroup 0 2013-01-10 21:02 /user/hadoop/intoday drwxr-xr-x - hadoop supergroup 0 2013-01-10 21:03 /user/hadoop/outtoday [hadoop@master conf]$ hadoop fs -ls intoday Found 2 items -rw-r--r-- 1 hadoop supergroup 2 2013-01-10 21:02 /user/hadoop/intoday/file1.txt -rw-r--r-- 1 hadoop supergroup 2 2013-01-10 21:02 /user/hadoop/intoday/file2.txt
可以看到 intoday 文件已经回复 ，file1.txt file2.txt 也已经恢复
4、清空回收站命令：hdfs dfs -expunge
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原文地址：hadoop学习笔记 – 回收站机制的开启, 感谢原作者分享。
