I sent my gmond.conf in my previous email... and the address is like carlos wrote.
I'll change the hadoop-metrics file and check again. However, I would prefer to use a method I'm more familiar with - like unicast tcp communication. Do you know what I need to change in ganglia and / or hadoop to use it ? Thanks. On Tue, Mar 17, 2009 at 5:16 PM, Brian Bockelman <bbock...@cse.unl.edu>wrote: > > On Mar 17, 2009, at 10:08 AM, Carlos Valiente wrote: > > On Tue, Mar 17, 2009 at 14:56, Tamir Kamara <tamirkam...@gmail.com> >> wrote: >> >>> I don't know too much about multicast... and I'm using the default gmond >>> conf file. >>> >> >> The default multicast address seems to be 239.2.11.71, so that's the >> one for your hadoop-metrics.properties. >> > > Yup, try that - although I could tell better if I had Tamir's gmond.conf, > of course. > > >> >> Wouldn't using the multicast address mean I'll need to specify a >>> different >>> address for each node so that the data won't get to all nodes running >>> gmond >>> >> >> > The design of Ganglia is such that all the data goes at all the nodes > running gmond. If you don't like it, Ganglia 3.1 supports non-multicast TCP > channels. > > For reference, our 200 node cluster has about 250KB/s of background chatter > on idle nodes, which is probably Ganglia-related. It's an incredibly small > perturbation on network traffic. > > Brian > > > I'm not an expert, either --- I'm using the same multicast address on >> all nodes in my cluster. On each node, tcpdump shows incoming Ganglia >> traffic from every other node to the multicast address. It's usually a >> burst of about 200 UDP packets every 4 seconds or so (for a 6-node >> cluster), so the traffic overhead should be negligible. >> >> C >> > >
