On 14/06/11 22:01, MilleBii wrote:
I want/need to upgrade my namenode/secondary node hardware. Actually also
acts as one of the datanodes.
Could not find any how-to guides.
So what is the process to switch from one hardware to the next.
1. For HDFS data : is it just a matter of copying all the hdfs data from old
server to new server.
yes, put it in the same place on your HA storage and you may not even
need to reconfigure it. If you didn't shut down the filesystem cleanly,
you'll need to replay the edit logs.
2. what about the decommissioning procedure of data node, is it necessary in
that case ?
You shouldn't need to. This is no different from handling failover of a
namenode, which you ought to try from time to time anyway, with two
common tactics
-have ready-to-go replacement servers with the same hostname/IP and
shared storage
-have ready-to-go replacement servers with different hostnames, then
with your cluster management tools bounce the workers into a new
configuration.
3.For MapRed: need to change the master in cluster configuration files
I'd give the new boxes the same hostnames and IPAddresses as before, and
nothing else will notice. And I recommend having good cluster management
tooling anyway, of course.
