I start the cluster by formatting the namenode after deleting all
folders (check,name,data,mapred) & previous data is lost. It's urgent
Now for my knowledge base, Don't we start our namenode from our SNN
check directory if by mistake we format the namenode.
Some latest data might be missing.
If yes, what are the steps to do this.
Thanks
Harsh J wrote:
I believe the format must have killed it all away. You might be lucky
with the SNN location if you were running it, though - could you check
in the SNN's directory for valid fsimage?
On Thu, Apr 28, 2011 at 12:53 PM, Adarsh Sharma
<[email protected]> wrote:
I correct my posting that this problem arises due to running a script that
internally issue below commands as root user:
bin/hadoop namenode -format
bin/start-all.sh
No is it possible to start the previous cluster with the previous data or
not.
Thanks
Adarsh Sharma wrote:
Thanks harsh,
My dfs.name.dir is /home/hadoop/project/hadoop-0.20.2/name
& there is only one file fsimage inimage directory & current directory is
empty.
But there must be four files fsname, edits, image etc in current
directory. How they got deleted even I don't issue format command yet.
I think there must be a remedy to get the previous data.
Harsh J wrote:
Hello Adarsh,
On Thu, Apr 28, 2011 at 11:02 AM, Adarsh Sharma
<[email protected]> wrote:
After correcting my mistake , when I try to run with the hadoop user, my
Namenode fails with the below exception\ :
2011-04-28 10:53:49,608 ERROR
org.apache.hadoop.hdfs.server.namenode.FSNamesystem: FSNamesystem
initialization failed.
java.io.IOException: NameNode is not formatted.
at
org.apache.hadoop.hdfs.server.namenode.FSImage.recoverTransitionRead(FSImage.java:317)
Do you still have the valid contents in your good ${dfs.name.dir}? You
should be able to recover with that.
