在hdfs中，默认的文件删除保留的时间是0，，也就是没有保留删除的文件，删除即丢失
那么如果你想启用hdfs的回收站机制，在删除文件后，希望多久之后，文件才消失，因为这个过程中万一你想来恢复文件呢
<property><name>fs.trash.interval</name><value>1440</value></property>将以上配置添加到core-site.xml中即可，1440表示删除的文件保存1440分钟，在这个期间你都可以恢复你的文件
[root@com22 bin]# sh hdfs dfs -ls -R /flume/events/2015/01/28/15/55-rw-r–r– 3 root supergroup12207 2015-01-28 15:56 /flume/events/2015/01/28/15/55/cmcc.1422431701282[root@com22 bin]# sh hdfs dfs -rm /flume/events/2015/01/28/15/55/cmcc.142243170128215/03/05 14:28:00 INFO fs.TrashPolicyDefault: Namenode trash configuration: Deletion interval = 1440 minutes, Emptier interval = 0 minutes.Moved: 'hdfs://com22.authentication:9000/flume/events/2015/01/28/15/55/cmcc.1422431701282' to trash at: hdfs://com22.authentication:9000/user/root/.Trash/Current[root@com22 bin]# 入上图所示，设置回收站之后，每当你删除文件时，都会打印该文件被删除后放到哪里去了，如果你想恢复，mv就可以了
整个过程如下：
[root@com22 bin]# sh hdfs dfs -ls -R /flume/events/2015/01/28/15/55[root@com22 bin]# sh hdfs dfs -ls -R /user/root/.Trash/Currentdrwx—— – root supergroup0 2015-03-05 14:28 /user/root/.Trash/Current/flumedrwx—— – root supergroup0 2015-03-05 14:28 /user/root/.Trash/Current/flume/eventsdrwx—— – root supergroup0 2015-03-05 14:28 /user/root/.Trash/Current/flume/events/2015drwx—— – root supergroup0 2015-03-05 14:28 /user/root/.Trash/Current/flume/events/2015/01drwx—— – root supergroup0 2015-03-05 14:28 /user/root/.Trash/Current/flume/events/2015/01/28drwx—— – root supergroup0 2015-03-05 14:28 /user/root/.Trash/Current/flume/events/2015/01/28/15drwx—— – root supergroup0 2015-03-05 14:28 /user/root/.Trash/Current/flume/events/2015/01/28/15/55-rw-r–r– 3 root supergroup12207 2015-01-28 15:56 /user/root/.Trash/Current/flume/events/2015/01/28/15/55/cmcc.1422431701282[root@com22 bin]# sh hdfs dfs -mv /user/root/.Trash/Current/flume/events/2015/01/28/15/55/cmcc.1422431701282 /flume/events/2015/01/28/15/55[root@com22 bin]# sh hdfs dfs -ls -R /user/root/.Trash/Currentdrwx—— – root supergroup0 2015-03-05 14:28 /user/root/.Trash/Current/flumedrwx—— – root supergroup0 2015-03-05 14:28 /user/root/.Trash/Current/flume/eventsdrwx—— – root supergroup0 2015-03-05 14:28 /user/root/.Trash/Current/flume/events/2015drwx—— – root supergroup0 2015-03-05 14:28 /user/root/.Trash/Current/flume/events/2015/01drwx—— – root supergroup0 2015-03-05 14:28 /user/root/.Trash/Current/flume/events/2015/01/28drwx—— – root supergroup0 2015-03-05 14:28 /user/root/.Trash/Current/flume/events/2015/01/28/15drwx—— – root supergroup0 2015-03-05 14:31 /user/root/.Trash/Current/flume/events/2015/01/28/15/55[root@com22 bin]# sh hdfs dfs -ls -R /flume/events/2015/01/28/15/55-rw-r–r– 3 root supergroup12207 2015-01-28 15:56 /flume/events/2015/01/28/15/55/cmcc.1422431701282[root@com22 bin]#
为我祈祷平安就好。我的旅行，会有你们的故事陪伴，所以我不会孤单。放心吧。
