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From "Edward Capriolo" <edlinuxg...@gmail.com>
Subject Re: nagios to monitor hadoop datanodes!
Date Wed, 08 Oct 2008 13:20:03 GMT
The simple way would be use use nrpe and check_proc. I have never
tested, but a command like 'ps -ef | grep java  | grep NameNode' would
be a fairly decent check. That is not very robust but it should let
you know if the process is alive.

You could also monitor the web interfaces associated with the
different servers remotely.

check_tcp!hadoop1:56070

Both the methods I suggested are quick hacks. I am going to
investigate the JMX options as well  and work them into cacti

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