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hadoop 3.0.1 one Host is down

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hadoop 3.0.1 one Host is down

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Hi,

I am new in Hadoop(HDP 3.0), i would like to know what to do when a host/slave component is down? I believe that one of the worker node is currently down and i would like to know what would be the right procedure to turn it back up?

note: It seems that according to ambari the services on that host are still running


Thank you