Let me correct myself.
- backup of dfs.data.dir and dfs.name.dir on NN and SNN
- If secondary namenode is not running on same machine as namenode,
copy over the fs.checkpoint.dir from secondary onto namenode.
- If you want to override NN image by SNN's image , delete the
dfs.name.dir (dfs.name.dir has been backed-up)
- start only the namenode with "-importCheckpoint"
-
For additional info :
https://issues.apache.org/jira/browse/HADOOP-2585?focusedCommentId=12558173#action_12558173
-Sagar
Sagar Naik wrote:
Take backup of you dfs.data.dir (both on namenode and secondary
namenode).
If secondary namenode is not running on same machine as namenode, copy
over the fs.checkpoint.dir from secondary onto namenode.
start only the namenode . The "importCheckpoint" fails for a valid NN
image. If you want to override NN image by SNN's image , delete the
dfs.name.dir
For additional info :
https://issues.apache.org/jira/browse/HADOOP-2585?focusedCommentId=12558173#action_12558173
Pl note I am not an expert.
Just had similar problem and this worked for me
-Sagar
Yossi Ittach wrote:
Hi all
I apologize if the topic has already been answered - I couldn't find it.
I'm trying to restart a failed NN using "hadoop namenode
-importCheckpoint"
, and the SNN is configured on another server. However , the NN keeps
looking for the SNN data folder on the local server , and not on the SNN
Server.
Any ideas?
10X!
Vale et me ama
Yossi
