Shulou(Shulou.com)06/03 Report--

After Hadoop clustering has been formatted twice, you may need to redo the system, but there are also ways to recover:

1.cd / usr/local/hadoop-0.20.2-cdh4u5/

2.Cd / tmp/ (default is under tmp). As long as the hadoop cluster is installed, there will be a directory like hadoop-hadoop after ls.

3.Cd hadoop-hadoop/

4.Ls (then there will be a directory of dfs, where all the dfs files exist)

5.Cd / dfs

6.Ls (then there will be name,name where the master node exists)

7.Cd name

8.Ls (with current, where all file rights exist)

9.Cd current/

10.Ls

11.Vi version (then look at yourself ID)

twelve。 Clone another session, ssh H202 (a slave node)

13.Cd / tmp/

14.Cd hadoop-hadoop/

15.Cd dfs/ (at this point there is only data, no name, because there is no name from the slave node

16.Cd data/

17.Cd current/

18.Vi version, at this time to see if your ID is the same as that of the main node, if it is not the same as the main node, you can repair it, so you can restore it.

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