On Tue, Sep 22, 2009 at 9:05 AM, Vladimir Vuksan <vli...@veus.hr> wrote: > I guess a lot of the conversation depends on what you want and expect > Ganglia to be used for. For example there are a lot of people out there > that are using Ganglia for performance monitoring and using Nagios NRPE > to get user level stats from the host. To me that is redundant.
indeed, this is one of the many flaws with the monitoring/alerting setups we have today, it's almost like the people collecting metrics and those making checks didn't like each other and never talked, but have to meet in secret in the sysadmin's bedroom... > Thus if > you decide you are gonna use Ganglia for providing metric to e.g. Nagios > you will have to go the route of parsing the Gmond XML. I checked on my > cluster and each host uses about 15 kBytes (average) of XML to define > metrics. This works well in small to mid size clusters however as soon > as you get over certain threshold it breaks down. Let's say > > 200 hosts * 15 kB = 3 MB > > if I wanted to keep track of one metric that would be about 600 MBytes > of traffic per minute or 10 Mbytes/sec just to fetch the whole XML tree. > More metrics that need to be checked ie. swap_free and you may be doing > quite a bit of network traffic. This is just to serve the XML and it > doesn't take into account overhead processing and parsing data. > > You'll say wait a minute :-) if I was doing such a thing I would cache > the data etc. I hear some people are doing just that ie. /me raises hand > storing XML on > local storage. I have couple ideas myself but the point is that such a > set up requires yet another thing to setup, monitor and maintain. indeed, not to mention your data has to be cached for longer than it could if there was less of it to exchange each time (on large setup you need caching no matter what) > Also perhaps REST API is not really the way to go but a simple HTTP > interface would suffice. > > I hope this makes sense :-). It did, except that last bit... how is a simple HTTP interface the way to go but a REST API perhaps not? Given the pretty simple and easy to represent data model I don't see how structuring your HTTP calls so that they are RESTful is not the way to go. If you said that an http interface is too much and a simpler TCP one would suffice I'd disagreed, but understood, while I'm instead lost on the simple HTTP Vs REST API. cheers -- "Behind every great man there's a great backpack" - B. ------------------------------------------------------------------------------ Come build with us! The BlackBerry® Developer Conference in SF, CA is the only developer event you need to attend this year. Jumpstart your developing skills, take BlackBerry mobile applications to market and stay ahead of the curve. Join us from November 9-12, 2009. Register now! http://p.sf.net/sfu/devconf _______________________________________________ Ganglia-developers mailing list Ganglia-developers@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/ganglia-developers
