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From Zhanlei Ma <...@vmware.com>
Subject RE: How to Recommission?
Date Thu, 01 Apr 2010 03:28:34 GMT
I got it,Thanks

-----Original Message-----
From: Michael Thomas [mailto:thomas@hep.caltech.edu] 
Sent: 2010年4月1日 11:17
To: general@hadoop.apache.org
Subject: Re: How to Recommission?

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.


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