On Mon, 10 Jan 2011 15:52:50 -0800, Bernard Li <bern...@vanhpc.org> wrote:
> I have a perhaps naive question. It sounds like > send_metadata_interval is only relevant to unicast configuration, so > why is multicast affected as well? How difficult of a code change > would it be if we make the send_metadata_interval directive to only > affect unicast? > > Also multicast is the default configuration due to historic reasons > but not because it is more common. It is however easier to set up if > your environment supports it. Is it time for us to evaluate whether > we should switch to unicast as the default? And if so how? What is > the actual spread between unicast and multicast users? If it turns > out that the majority of our (new) users are using unicast, should we > spend more time/effort making it easier for them to use Ganglia? > >> 300 or 600 seconds is probably good enough for a default. But no matter >> what the default is, users still have to understand what that directive >> is for and how to optimize it. The value of send_metadata_interval will >> probably be different for every installation when you take into >> consideration the number of nodes, the number of metrics and any other >> network related variables. > > A couple more ideas came out of a brief brainstorming session on IRC > between Vladimir, Jesse and myself: > > 1) Collector gmond should request metadata from all gmonds when it has > been freshly (re)started > 2) Add a configuration check for gmond so upon starting, if > configuration is unicast-based, and send_metadata_interval is 0, warn > the user to set it to a sane number > 3) Find a middle ground of default send_metadata_interval which does > not hurt new users in HPC space wanting to use unicast > > 2) and 3) are workarounds which could be implemented relatively > quickly, 1) maybe not so much. I think send_metadata_interval would also be a problem if you set all your agents to be deaf except the collector node(s). I have done just that for security reasons. Vladimir ------------------------------------------------------------------------------ Protect Your Site and Customers from Malware Attacks Learn about various malware tactics and how to avoid them. Understand malware threats, the impact they can have on your business, and how you can protect your company and customers by using code signing. http://p.sf.net/sfu/oracle-sfdevnl _______________________________________________ Ganglia-developers mailing list Ganglia-developers@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/ganglia-developers
