hadoop学习笔记–回收站机制的开启

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
?

?
 fs.trash.interval  
 1440  
 Number of minutes between trash checkpoints.   
 If zero, the trash feature is disabled.   
?

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。