[Hawkular-dev] Low-impact clients and never dropping any events

[Thomas Segismont]

Le 13/02/2015 19:01, Randall Hauch a écrit :
> Oh, one more thing:
>
>>> On Feb 13, 2015, at 10:49 AM, Thomas Segismont <tsegismo at redhat.com
>>> <mailto:tsegismo at redhat.com>> wrote:
>>> ...
>>> Hawkular metrics comes in two forms:
>>> * a Java library (metrics-core)
>>> * a Java EE web application (built on top of the library)
>>>
>>> metrics-core can be embedded in any sort of JVM application but it
>>> expects to find a Cassandra cluster somewhere.
>
> I understand that the collectors will be libraries; you’ll probably
> eventually want these in multiple languages. But it sure seems strange
> to have the Hawkular engine (for lack of a better term) be a library.
> Not only is that more complicated to set up, but if you design it to be
> embeddable then it will be harder to also make it scale.
>

Most consumers of the metrics tool will use the web application. The 
metrics-core library might be used in projects in advanced integration 
scenarios.

> It sure seems easier to focus on only installing Hawkular as a separate
> (potentially distributed) system that is set up and used. Sure, config
> it to point to the Cassandra cluster. But that can be easily wrapped up
> in a Docker image that people download and simply start, pointing via
> ENV variables to a Cassandra instance/cluster (perhaps also started from
> a Docker image). Better still is that these Docker images can be wrapped
> in a Kubernetes pod (that uses a Cassandra pod) and deployed on
> OpenShift. Now you have Hawkular as a service, but still easily
> installed on a customer’s network.
>

This is already in our plans.