Hi Timothy:
On Thu, Apr 3, 2008 at 2:58 PM, Witham, Timothy D
<[EMAIL PROTECTED]> wrote:
> Correct. The gmetad pulling from clusters must get all the data from
> all hosts since it logs RRDs for all hosts, clusters and the summary for
> the grid of clusters. Unfortunately, it hands all this data out to any
> higher parent gmetads which recalculate the single sum that they need.
> Finally when you get to a grandparent gmetad, you get a much smaller sum
> from the parent of the leaf gmetad.
So does it mean that if I want to have a gmetad whose sole purpose in
life is to suck down data from other gmetads, it has no choice but to
receive *all* metrics data from port 8651? It sounds like what I
really want is for gmetad.conf to support the following syntax:
data_source "grid1" grid1:8652:"/?filter=summary"
Is something like this possible right now?
> Exactly. The /?filter=summary on the interactive port is even more
> information than the calling gmetad needs since it needs only the final
> sum, not the sums of each of the sources. A new command to send only
> the final grid sum is what we need. I quickly hacked
>
> write(sock->sockfd, "/?filter=summary\n",
> sizeof("/?filter=summary\n"));
>
> into data_thread.c just before it starts reading from sock and
> configured a data source to read from interactive port. This works but
> gets a double count I assume because of the redundant data in the XML.
> Unfortuantely, the hack causes gmond sources to close connection
> prematurely I assume because of the unexpected input. But if we fixed
> the code to accept input from the connecting gmetads, then we would only
> need 1 port and we could request only the data needed.
I'll let you work out the details, but what is the purpose of the
interactive port? Who/what actually makes use of the filtering? Is
it for data processing for the web frontend?
I think I am finally seeing the light at the end of the tunnel ;-)
Cheers,
Bernard
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