Namenode doesn’t start after upgrading Hadoop version

I have copied all the files correctly, all my jars are in place. I’ve set all the important properties correctly (i.e. namenode address,etc). I have formatted the HDFS .Now I am trying to start the cluster.

If you are running the cluster which is 0.20 version or before, and if you upgrade to 1.0.4 or above, while you restart the cluster by saying All the demons should have started on the respective machines. (masters and slaves). But my namenode is not starting……..

This is due to file system changes in the HDFS itself. If you check the log you will see :

File system image contains an old layout version -18. An upgrade to version -32 is required.

Solution :

Very simple :

No need to stop other demons (you can stop if you want but it is not required).

Use -upgrade   (Here upgrade is mandatory).

Using jps you can see that now namenode is also running!



Leave a Reply

Fill in your details below or click an icon to log in: Logo

You are commenting using your account. Log Out /  Change )

Google+ photo

You are commenting using your Google+ account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )


Connecting to %s

%d bloggers like this: