[Hawkular-dev] plan for HOSA to store inventory collected by Java Agent

[John Mazzitelli]

Because Origin Metrics is locked down. Without special privileges (that only HOSA and Heapster have) no one can write to the Origin Metrics that is installed in the OpenShift cluster.

And, yes, we asked. :) This was plan B.

----- Original Message -----
> I would have replied to my own mail, but I have no idea where it's
> actually surfing at the moment. Perhaps it's using NCSA Mosaic to load
> Gmail.
> 
> In any case, second thing, why is only HOSA allowed to contact the
> metrics and not the Java-agent? Perhaps we should also consider allowing
> it to report directly to the metrics instance (both ways could be
> supported).
> 
>    -  Micke
> 
> 
> On 04/26/2017 07:35 PM, John Mazzitelli wrote:
> > The first use-case for needing HOSA to collect and store inventory has come
> > in - from the Fuse team, specifically. This email is going to explain the
> > current plan to get this to happen. Feel free to chime in with thoughts.
> >
> > Right now, HOSA does not support collecting and storing inventory. HJA (and
> > HWFA) supports collecting and storing inventory along with metrics.
> >
> > HOSA has the privileges necessary to write directly to Origin Metrics. HJA
> > does not.
> >
> > We need to combine these to get what we need (and we need this soon because
> > Fuse needs it).
> >
> > Currently, the idea is:
> >
> > a) HJA will have a new storage adapter mode "HOSA" (right now it has
> > "HAWKULAR" and "METRICS" - the former is to support running with a full
> > hawkular server such as when running within CloudForms and the latter is
> > for when running with just a H-Metrics server). With this new HOSA mode,
> > HJA will not store metrics or inventory directly into H-Metrics. Instead
> > it will "cache" the data and wait for HOSA to come and ask for the data.
> >
> > b) HOSA will have a new endpoint type "hawkular" (right now it has
> > "prometheus" and "jolokia" and "json"). This new type will tell HOSA to
> > read data from some HJA (which will including inventory data) and HOSA
> > will simply pass that data on to Origin Metrics. HOSA will read both
> > metrics and inventory from HJA and HOSA will store that data directly to
> > Origin Metrics essentially making HOSA a proxy to Origin Metrics.
> >
> > I don't know if HOSA will decorate the data with its own metadata (like
> > tags and things) or if it will truly be a pass-through. I suspect HOSA
> > will need to massage the data it gets from HJA to ensure the data IDs are
> > unique across the OpenShift cluster and things like that.
> >
> > That's the overall idea. I'm sure there are going to be stumbling blocks
> > along the way that is going to force us to change some things around. But
> > at a high level, I think it should work. HJA caches inventory and metrics
> > rather than writing directly to an H-Metrics server - and HOSA will
> > collect that cached data in HJA and it will be the one to store it in
> > Origin Metrics.
> > _______________________________________________
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> > hawkular-dev at lists.jboss.org
> > https://lists.jboss.org/mailman/listinfo/hawkular-dev
> 
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