1、查看镜像文件
[xiaoqiu@s150 /home/xiaoqiu/hadoop_tmp/dfs/name/current]$ ls -h |grep fsimage
fsimage_0000000000000000000
fsimage_0000000000000000000.md5
fsimage_0000000000000000966
fsimage_0000000000000000966.md5
[xiaoqiu@s150 /home/xiaoqiu/hadoop_tmp/dfs/name/current]$ hdfs oiv -i /home/xiaoqiu/hadoop_tmp/dfs/name/current/fsimage_0000000000000000966 -o a.xml -p XML
[xiaoqiu@s150 /home/xiaoqiu/hadoop_tmp/dfs/name/current]$ ll |grep .xml
-rw-rw-r--. 1 xiaoqiu xiaoqiu 4438 Dec 28 19:30 a.xml
[xiaoqiu@s150 /home/xiaoqiu/hadoop_tmp/dfs/name/current]$ cat a.xml
2、查看编辑日志
[xiaoqiu@s150 /home/xiaoqiu/hadoop_tmp/dfs/name/current]$ hdfs oev -i /home/xiaoqiu/hadoop_tmp/dfs/name/current/edits_0000000000000000967-0000000000000000967 -o b.xml -p XML
[xiaoqiu@s150 /home/xiaoqiu/hadoop_tmp/dfs/name/current]$ ll |grep b.xml
-rw-rw-r--. 1 xiaoqiu xiaoqiu 204 Dec 28 20:32 b.xml
[xiaoqiu@s150 /home/xiaoqiu/hadoop_tmp/dfs/name/current]$ cat b.xml
3、启用滚动编辑日志
hdfs dfsadmin -rollEdits