Hadoop 2.x 快照
$ ./bin/hdfs dfsadmin -allowSnapshot /Allowing snaphot on / succeeded
$ ./bin/hdfs dfs -put ../test1.txt /test1.txt
$ ./bin/hdfs dfs -ls /
Found 1 items
-rw-r--r-- 1 hadoop supergroup 12 2014-08-31 23:26 /test1.txt
$ ./bin/hdfs dfs -createSnapshot /
Created snapshot /.snapshot/s20140831-232654.464
$ ./bin/hdfs dfs -ls /.snapshot
Found 2 items
drwxr-xr-x - hadoop supergroup 0 2014-08-31 23:24 /.snapshot/s20140831-232445.185
drwxr-xr-x - hadoop supergroup 0 2014-08-31 23:26 /.snapshot/s20140831-232654.464
#恢复快照
$ ./bin/hdfs dfs -mkdir /tmp
$ ./bin/hdfs dfs -cp /.snapshot/s20140831-232654.464 /tmp
$ ./bin/hdfs dfs -cat /tmp/s20140831-232654.464/test1.txt
hello world
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