hadoop的回收站功能

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hadoop 的回收站trash功能默认是关闭的，所以需要在core-site.xml中手动开启：

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

fs.trash.interval 的含义时文件删除后保留时长，默认为0，单位为分钟。
测试操作如下：
[david@namenode hadoop-0.20.203.0]bin/hadoopfs−rmr/user/david/user18.csvMovedtotrash:hdfs://namenode:9000/user/david/user18.csv[david@namenodehadoop−0.20.203.0] bin/hadoop fs -ls /user/david/.Trash
Found 1 items
drwxr-xr-x - david supergroup 0 2011-10-19 18:27 /user/david/.Trash/Current
[david@namenode hadoop-0.20.203.0]bin/hadoopfs−ls/user/david/.Trash/CurrentFound1itemsdrwxr−xr−x−davidsupergroup02011−10−1918:27/user/david/.Trash/Current/user[david@namenodehadoop−0.20.203.0] bin/hadoop fs -ls /user/david/.Trash/Current/user/
Found 1 items
drwx—— - david supergroup 0 2011-10-19 18:27 /user/david/.Trash/Current/user/david
[david@namenode hadoop-0.20.203.0]bin/hadoopfs−ls/user/david/.Trash/Current/user/davidFound1itemsdrwxr−xr−x−davidsupergroup02011−09−2216:23/user/david/.Trash/Current/user/david/user18.csv[david@namenodehadoop−0.20.203.0]
注意：回收站位于用户目录下，例：/user/hadoop
清空回收站命令：hdfs dfs -expunge

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