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
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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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