Hello Daniel,
>>If you would like, I can suggest some activities to help you get to
know Ganglia or use Ganglia with PostgreSQL
>>Looking in Google, I found some PostgreSQL metrics for Ganglia but
at least one of those projects clearly states it is no longer
maintained.
>>It would be particularly interesting to
>>a) see this implemented in C as a Ganglia module (see
ganglia-modules-linux for examples of Ganglia modules written in C)
>>b) make a generic module that can run any database query and return
the results as metrics
Do you mean a module to interact with the database in Postgres to run queries?
>>One particular thing to keep in mind is that Ganglia prefers metrics
to return rates or delta values rather than raw values. E.g. if
>>PostgreSQL has a metric that returns the total number of queries
since PostgreSQL started, then a metric module should sample that >>value
at regular intervals and calculate the rate (e.g. number of
queries per second) and that is the value that will be transmitted
through >>Ganglia, stored in the RRD and charted.
I get the context, but any reason as per why this happens in metrics than raw
values?
>>Another area you could look at is gmetad. In version 3.1.0, module
support was added to the gmond component but there is currently no >>module
support in gmetad. If you want to learn a little bit more
about dlopen then you could study how it is done in gmond and then
try to >>implement a similar API for gmetad to support plugin
modules. In gmond, modules are used for inputs - polling the
metrics. In gmetad, >>the modules would probably be used for outputs,
e.g. gmetad would call each module with different events (metric
received, new host >>detected, host appears down, etc) and the modules
could then do things like writing the events to databases or sending
them to other >>infrastructure or message queues.
Let me do some more research on gmetad, could you redirect me some useful wikis
to read?
Thank youHitesh Ramani ------------------------------------------------------------------------------
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