resending it, after getting added to the group.
Hi,
>
> I have got ganglia enabled recently using multicast configuration for
> couple of clusters, one of them is large node clusters typically some good
> part of them are nodes having lots of metrics in the range of 600-800.
>
> After enabling only the default ganglia metrics, the graphs are good but
> once the custom system metrics are flowing using the gmond multicast
> configuration, graphs tend to be broken in the sense they are
> intermittently blank.
> Quite frequently, almost all of the hosts in the cluster are down and for
> a while they come up again.
>
> I am using default poll interval of 15s in gmetad.conf for a cluster
> data_source and they are more than 1 data sources configured for a cluster,
> although I see that only other data sources are used incase the first one
> is not reachable over the gmond port.
> BTW, I also have enabled the gmond buffer to 10M. I am not sure how do I
> calculate the exact buffer required for gmond with respect to the number of
> exhaustive metrics in the cluster for lots of nodes. If there is a
> relation, like combination of the data types being used for all the metrics
> on a node and the frequency intervals, then I will make up for it. Please
> do let me know in this regard.
>
> Earlier there was a problem with the web interface, error 400 crept in.
> After looking into apache error logs, it was found to be with the memory
> setting of php. So, I increased good amounts for php memory limits for
> ganglia in apache configuration, so that seems to be okay. But the graphs
> being intermittently blank (quite frequently) and hosts showing as down in
> the cluster view is little irritating.
>
> I am wondering if there are any settings that are to be considered for
> optimal usage of the ganglia in large clusters using multicast
> configuration.
>
> Thanks,
> Nikhil
>
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