Matt Klaric,
I am seeing this same problem as well. There seems to be a problem with
how gmetad computes the summaries for each grid. It seems as though it
resets it's count of machines each processing loop. When it is asked by
the front end, it seems as though gmetad has not yet finished its
counting, so you get incomplete numbers for the grid summary. The odd
thing is that cluster summaries work just fine.
As an aside, I think I have noticed that you are using each machine on
your cluster as a data_source. Normally you would just have one of the
machines on the cluster as a data source, as well as backup nodes for
redundancy. If you were using multicast, all your nodes would share
information on the multicast channel. This is all defined in your
gmond.conf. Using the data in your example, I would suggest that your
gmetad look more like:
data_source "foo" 192.168.7.10 192.168.7.11
This way you do not need to define every node in the cluster in the
gmetad config file (as separate clusters)
Ian
Matt Klaric wrote:
I've installed Ganglia v3.0.1 and setup the web interface to gmetad.
I've setup this up on a small cluster of 5 machines using the default
configuration for gmond by using the command 'gmond -t'. I've put this
config file no all the nodes.
Then I setup my gmetad.conf file as follows:
data_source "a" 192.168.7.10
data_source "b" 192.168.7.11
data_source "c" 192.168.7.12
data_source "d" 192.168.7.13
data_source "e" 192.168.7.14
gridname "foo"
When I look at the web interface for Ganglia I notice that the image
showing the number of CPUs in the cluster is not accurate. It
oscillates up and down over time despite nodes not being added or
removed from the cluster. It's reporting anywhere from 8 to 14 CPUs in
the cluster when there are really 20 CPUs in the 5 boxes. (The text to
the left of this image does indicate there are 20 CPUs in 5 hosts.)
Additionally, "Total In-core Memory" shown in the cluster on this
interface is lower than the sum of the amount of RAM in all boxes and
varies over time.
However, if I look at the stats for any one node in the cluster the
values are correct and constant over time.
Has anyone seen these kinds of problems? How have you addressed them?
Thanks,
Matt
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