Alan Woodward created SOLR-4735:
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Summary: 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: Alan Woodward
Priority: Minor
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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