5:39 p.m.
I agree that you won't want to mix everything, but you can still adopt some
groupings that are meaningful, for instance group all front-end servers
into a front-end availability series, and all back-ends into another series.
Moreover, once you get all the availability as ratio, it's easy to map to a
binary availability if it's what you're looking for. The REST api will
provide the data, then it's up to you to display what is the most relevant.
I think ratio datapoints is an easy-to-use, yet complete, information.
Joel
On Tue, Aug 30, 2016 at 5:16 PM, Michael Burman <miburman(a)redhat.com> wrote:
Hi,
So if I have 8 MySQLs, 4 primaries, 4 replicas. One primary is down and
the replica of that set is down as well. I request Availability of my
datastore and I get 80% UP. If I had two replicas down instead, I would get
80% UP. There's a huge difference in these scenarios.
I'm not a fan of percents for that simple reason. Is my service up? Yes,
it's 99% up, only all the front-end servers are down.. ugh.
- Micke
----- Original Message -----
From: "John Sanda" <jsanda(a)redhat.com>
To: "Discussions around Hawkular development" <
hawkular-dev(a)lists.jboss.org>
Sent: Tuesday, August 30, 2016 4:11:07 PM
Subject: Re: [Hawkular-dev] Availability metrics: aggregate stats series
I like the idea of aggregated availabilities, but I don’t know that it can
easily be simplified to up/down. Let’s say we have 3 Cassandra nodes
deployed with replication_factor = 1. If one node goes down we are at 66%
availability.
> On Aug 29, 2016, at 3:24 AM, Joel Takvorian <jtakvori(a)redhat.com> wrote:
>
> Hello all,
>
> I'm still aiming to add some features to the grafana plugin. I've
started to integrate availabilities, but now I'm facing a problem when it
comes to show aggregated availabilities ; for example think about an
OpenShift pod that is scaled up to several instances.
>
> Since availability is basically "up" or "down" (or, to simplify
with the
other states such as "unknown", say it's either "up" or
"non-up"), I
propose to add this new feature: availability stats with aggregation. The
call would be parameterized with an aggregation method, which would be
either "all of" or "any of": with "all of" we consider that
the aggregated
series is UP when all its parts are UP.
>
> It would require a new endpoint since the AvailabilityHandler currently
only expose stats queries with metric id as query parameter - not suitable
for multiple metrics.
>
> Any objection or remark for this feature?
>
> Joel
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