ASF subversion and git services commented on SOLR-4735:

Commit 1bc01d25ef2fa8fa015ba2fdb5b2ffc8ae3cec0a in lucene-solr's branch 
refs/heads/feature/metrics from [~ab]
[ https://git-wip-us.apache.org/repos/asf?p=lucene-solr.git;h=1bc01d2 ]

SOLR-4735 Introduce a concept of top-level group of metrics for things
that happen outside SolrCore.

> 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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