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https://issues.apache.org/jira/browse/SOLR-4735?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15715880#comment-15715880
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Jeff Wartes commented on SOLR-4735:
-----------------------------------
`MetricRegistry` is really just a bunch of convenience methods and
thread-safety around a `MetricSet`. There isn't much overhead difference
between the two. But really, when I think of a MetricRegistry, I think of it as
"a set of metrics I want to attach a reporter to", nothing more.
It's a bit disappointing that reporters take a Registry instead of a MetricSet,
since a Registry isa MetricSet.
With that in mind, one strategy would be have every logical grouping of metrics
use its own dedicated (probably shared) registry, and then bind the
reporter-registry concept together at reporter definition time.
That is, create a non-shared registry explicitly for the purpose of attaching a
reporter to it, and only when asked to define a reporter. The reporter
definition would then include the names of the registries to be reported. Under
the hood, a new registry would be created as the union of the requested
registries, and the reporter instantiated and attached to that. We'd have to
make sure the namespace of all the metrics in the metric groups is unique, so
that arbitrary groups can be combined without conflict, but that sounds
desirable regardless.
> Improve Solr metrics reporting
> ------------------------------
>
> Key: SOLR-4735
> URL: https://issues.apache.org/jira/browse/SOLR-4735
> Project: Solr
> Issue Type: Improvement
> Reporter: Alan Woodward
> Assignee: Andrzej Bialecki
> Priority: Minor
> Attachments: SOLR-4735.patch, SOLR-4735.patch, SOLR-4735.patch,
> SOLR-4735.patch
>
>
> Following on from a discussion on the mailing list:
> http://search-lucene.com/m/IO0EI1qdyJF1/codahale&subj=Solr+metrics+in+Codahale+metrics+and+Graphite+
> It would be good to make Solr play more nicely with existing devops
> monitoring systems, such as Graphite or Ganglia. Stats monitoring at the
> moment is poll-only, either via JMX or through the admin stats page. I'd
> like to refactor things a bit to make this more pluggable.
> This patch is a start. It adds a new interface, InstrumentedBean, which
> extends SolrInfoMBean to return a
> [[Metrics|http://metrics.codahale.com/manual/core/]] MetricRegistry, and a
> couple of MetricReporters (which basically just duplicate the JMX and admin
> page reporting that's there at the moment, but which should be more
> extensible). The patch includes a change to RequestHandlerBase showing how
> this could work. The idea would be to eventually replace the getStatistics()
> call on SolrInfoMBean with this instead.
> The next step would be to allow more MetricReporters to be defined in
> solrconfig.xml. The Metrics library comes with ganglia and graphite
> reporting modules, and we can add contrib plugins for both of those.
> There's some more general cleanup that could be done around SolrInfoMBean
> (we've got two plugin handlers at /mbeans and /plugins that basically do the
> same thing, and the beans themselves have some weirdly inconsistent data on
> them - getVersion() returns different things for different impls, and
> getSource() seems pretty useless), but maybe that's for another issue.
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