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From Michael Thomas <tho...@hep.caltech.edu>
Subject Re: How to Recommission?
Date Thu, 01 Apr 2010 03:17:21 GMT
On 03/31/2010 08:12 PM, Zhanlei Ma wrote:
> How to Recommission or decommission DataNode(s) in hadoop???
> Decommission(Del some Datanodes):
> On a large cluster removing one or two data-nodes will not lead to any data loss, because
name-node will replicate their blocks as long as it
>
[...]
>
>
>
> But how to Recommission? Wish your help.
> Thanks.
>

Remove the hostname from your dfs.hosts.exclude file and run 'hadoop 
dfsadmin -refreshNodes'.  Then start the datanode process in the 
'recommissioned' datanode again.

--Mike


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