Hi Clement
       You can get the full cluster status from the dfsadmin page at
http://<nn-host>:50070/dfshealth.jsp
. Alternatively you can try
hadoop dfs admin -report to get the cluster details
http://hadoop.apache.org/common/docs/current/commands_manual.html#dfsadmin

Regards
Bejoy.K.S

On Sun, Mar 18, 2012 at 11:30 PM, Clement Jebakumar <jeba.r...@gmail.com>wrote:

>
> Is there any API or command to get DataNode informaiton? like what are the
> nodes up or dead... their last beet.. and so on?

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