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From Павлухин Иван <vololo...@gmail.com>
Subject Fwd: [DISCUSSION][IEP-35] Metrics configuration
Date Mon, 01 Jul 2019 12:39:34 GMT
Nikolay, Igniters,

In my mind there are several configuration aspects:
1. Specifying subset of metrics which are exported to an external system.
2. Subset of metrics which is collected (enable/disable sensor).
3. A particular metric (sensor) parameters.

Are we going to address all points in the same config (file)? In my
experience with metrics (actually not so rich) I have not seen metric
configs similar to logging configs. Are there examples of such
practice in industry?

Also, looking at a line like "cache.my-cahe.GetLatency=50,100,250,500"
I cannot tell much from scratch. My first thought is that having named
parameters can be more readable, e.g. (roughly):
cache.my-cahe.GetLatency={
  intervals: [50, 100, 250, 500]
}

пт, 28 июн. 2019 г. в 13:02, Nikolay Izhikov <nizhikov@apache.org>:
>
> Hello, Alexey.
>
> Thanks for the feedback!
>
> > My only concert is that we should have the metrics framework configuration
> > as the first-citizen of the framework itself
>
> Yes. I planned to add `void configure(String param)` method to the metric API.
>
> > but change the metrics parameters in
> > runtime from JMX or command-line, etc.
>
> I've add requirement of JMX method to the ticket:
>
> https://issues.apache.org/jira/browse/IGNITE-11927
>
> > Another concern is to have an
> > ability to disable/enable metrics per metrics group/prefix.
>
> Yes, we discusss it.
> But, let's make it clear:
>
> *What is disabling metric?*
>
> Looks like exporter filter solve this task.
>
> В Чт, 27/06/2019 в 16:24 +0300, Alexey Goncharuk пишет:
> > Nikolay,
> >
> > My only concert is that we should have the metrics framework configuration
> > as the first-citizen of the framework itself. This way, we can configure
> > the metrics not only from file, but change the metrics parameters in
> > runtime from JMX or command-line, etc. Another concern is to have an
> > ability to disable/enable metrics per metrics group/prefix.
> >
> > The logger-like configuration meets these suggestions given that the
> > configuration is generalized into the metrics framework.
> >
> > What do you think?
> >
> > чт, 27 июн. 2019 г. в 12:30, Nikolay Izhikov <nizhikov@apache.org>:
> >
> > > Hello, Igniters.
> > >
> > > As you may know, I've contributed Phase1 [1] for IEP-35 [2].
> > > Now we have metrics subsystem and can create and export any metrics from
> > > Ignite.
> > >
> > > I think user(administrator of Ignite) should be able to configure some
> > > metrics params in a common way [3]
> > >
> > > I propose to use the same way from logging frameworks.
> > > We should define some file format Ignite can understand.
> > > An administrator fills configuration file to configure one or several
> > > metrics.
> > > Ignite will analyze the file and use provided params during metrics
> > > creation.
> > >
> > > For now, we have 2 types of metrics that should be configured:
> > >
> > >         *       HistrogramMetric [4]
> > >                 This metric is a count of measurement that falls into
> > > predefined intervals.
> > >                 An example is "Request processing time distribution".
> > >                 We want to calculate a count of requests processed quicker
> > > then 50ms, 50-100, 100-250, 250-500 and slower.
> > >
> > >         *       HitRateMetric [5]
> > >                 This metric is a count of events in the last time interval.
> > >                 An example is the "Count of requests processed in the last
> > > 5 seconds".
> > >
> > > Example of file content:
> > >
> > > ````
> > > cache.my-cahe.GetLatency=50,100,250,500 #Params for the histogram metric
> > > with the name `cache.my-cahe.get`
> > > cache.my-cache.RebalancingKeysRate=60000 #Param for existing HitRateMetric
> > > that hold "Estimated rebalancing speed in keys".
> > > ````
> > >
> > > Please, share your vision.
> > >
> > > [1]
> > > https://github.com/apache/ignite/commit/fdaa310430aefff07994eb35510d3416886b5bbe
> > > [2]
> > > https://cwiki.apache.org/confluence/pages/viewpage.action?pageId=112820392
> > > [3] https://issues.apache.org/jira/browse/IGNITE-11927
> > > [4]
> > > https://github.com/apache/ignite/blob/master/modules/core/src/main/java/org/apache/ignite/internal/processors/metric/impl/HistogramMetric.java
> > > [5]
> > > https://github.com/apache/ignite/blob/master/modules/core/src/main/java/org/apache/ignite/internal/processors/metric/impl/HitRateMetric.java
> > >



-- 
Best regards,
Ivan Pavlukhin

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