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:
<property>
<name>fs.trash.interval</name>
<value>1440</value>
<description>Number of minutes between trash checkpoints.
If zero, the trash feature is disabled.
</description>
</property>
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/hadoop fs -rmr /user/david/user_18.csv
Moved to trash: hdfs://namenode:9000/user/david/user_18.csv
[david@namenode hadoop-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/hadoop fs -ls /user/david/.Trash/Current
Found 1 items
drwxr-xr-x - david supergroup 0 2011-10-19 18:27 /user/david/.Trash/Current/user
[david@namenode hadoop-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/hadoop fs -ls /user/david/.Trash/Current/user/david
Found 1 items
drwxr-xr-x - david supergroup 0 2011-09-22 16:23 /user/david/.Trash/Current/user/david/user_18.csv
<property>
<name>fs.trash.interval</name>
<value>1440</value>
<description>Number of minutes between trash checkpoints.
If zero, the trash feature is disabled.
</description>
</property>
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/hadoop fs -rmr /user/david/user_18.csv
Moved to trash: hdfs://namenode:9000/user/david/user_18.csv
[david@namenode hadoop-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/hadoop fs -ls /user/david/.Trash/Current
Found 1 items
drwxr-xr-x - david supergroup 0 2011-10-19 18:27 /user/david/.Trash/Current/user
[david@namenode hadoop-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/hadoop fs -ls /user/david/.Trash/Current/user/david
Found 1 items
drwxr-xr-x - david supergroup 0 2011-09-22 16:23 /user/david/.Trash/Current/user/david/user_18.csv
[david@namenode hadoop-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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