I've helped out linking hadoop to munin using jmx querying in the past, 
there's a writeup at:

http://www.cs.huji.ac.il/wikis/MediaWiki/lawa/index.php/Munin_for_Hadoop

Stu
On Fri, May 11, 2012 at 02:15:16AM -0700, Lance Norskog wrote:
> zabbix does monitoring, archiving and graphing, and alerts.
> 
> It has a JMX bean monitor system. If Hadoop has these, or you can add
> them easily, you have a great monitor. Also, check out 'Starfish'.
> It's a little old, but I got it running and it was really cool.
> 
> On Thu, May 10, 2012 at 11:24 PM, Manu S <manupk...@gmail.com> wrote:
> > Thanks a lot Junyong
> >
> > On Fri, May 11, 2012 at 11:15 AM, JunYong Li <lij...@gmail.com> wrote:
> >
> >> Each has its own merits.
> >> http://developer.yahoo.com/hadoop/tutorial/module7.html#monitoring
> >>
> >> 2012/5/11 Manu S <manupk...@gmail.com>
> >>
> >> > Hi All,
> >> >
> >> > Which is the best monitoring tool for Hadoop cluster monitoring? Ganglia
> >> or
> >> > Nagios?
> >> >
> >> > Thanks,
> >> > Manu S
> >> >
> >>
> >>
> >>
> >> --
> >> Regards
> >> Junyong
> >>
> 
> 
> 
> -- 
> Lance Norskog
> goks...@gmail.com

-- 
>From the prompt of Stu Teasdale

Happiness is a hard disk.

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