I'm currently deploying ganglia 3.1.0. I noticed that there were problems with nodes appearing in the gmond xml feed with no metrics, or with fewer metrics than they should have.
My network config is as follows: udp_send_channel { host = borgdev20 port = 8650 } udp_recv_channel { port = 8650 } tcp_accept_channel { port = 8181 } It appears that when the gmond collecter, on borgdev20, receives a metric for which it has no metadata, which may happen (for example) when the collector has been restarted since the leaf nodes have been collected, it sends out a request for metadata. This seems reasonable. However, it sends it out to the udp_recv_channel, not to the host which sent the metric. This, I think, would work with multicast configs, but in the case of unicast, gmond sends the metadata request to itself, and then throws it in the bitbucket when it receives it. When I found this problem, I added send_metadata_interval = 15 to my gmond.conf, and this seems to resolve the issue. It does so, however, at the cost of much network traffic. It is probably a good idea to do two things here: 1) make gmond request metadata from the host which sent the unknown metric, if it is not running in multicast mode. 2) document that there is a new requirement for a working unicast system: in version 3.0.5, IIRC, the only requirement for leaves is that they be able to send packets to the collector. In version 3.1.0, the collector must be able to get a packet back to it's leaf nodes, unless the leaf nodes are sending periodic metadata. ------------------------------------------------------------------------- This SF.Net email is sponsored by the Moblin Your Move Developer's challenge Build the coolest Linux based applications with Moblin SDK & win great prizes Grand prize is a trip for two to an Open Source event anywhere in the world http://moblin-contest.org/redirect.php?banner_id=100&url=/ _______________________________________________ Ganglia-developers mailing list Ganglia-developers@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/ganglia-developers