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From "Hoss Man (JIRA)" <>
Subject [jira] Commented: (SOLR-256) Stats via JMX
Date Mon, 25 Jun 2007 21:18:27 GMT


Hoss Man commented on SOLR-256:

> Instead of starting its own, other alternative (as you have pointed out) could be to
use platform registry itself. In that > case:
> MBeanServer mbs = ManagementFactory.getPlatformMBeanServer(); 

that seems like the way to go.

 the one thing i'm not clear on is if there is simple  programmaticly way to tell when JMX
monitoring is already enabled so we can still do the check you have in the static block and
only use the JMXified impls if we need them (i'm assuming you put that in because there is
some overhead we want to avoid if JMX is not needed)

the javadocs for ManagementFactory.getPlatformMBeanServer() indicate that it creates on first
use ... so testing that won't work ... we could test for the system properties ourselves,
but i *think* servlet containers like jetty and tomcat have their own config file syntax for
enabling JMX and then call the neccessary underlying methods , so just becuase those properties
aren't set doesn't neccessarily mean anything right?

do you know if my guess about servlet containers programmaticly turning JMX on even without
the standard system properties being set is true? do you have any suggestions on how to deal
with this?  

> Stats via JMX
> -------------
>                 Key: SOLR-256
>                 URL:
>             Project: Solr
>          Issue Type: New Feature
>          Components: search, update
>            Reporter: Sharad Agarwal
>            Priority: Minor
>         Attachments: jmx.patch, jmx.patch, jmx.patch
> This patch adds JMX capability to get statistics from all the SolrInfoMBean.
> The implementation is done such a way to minimize code changes. 
> In SolrInfoRegistry, I have overloaded Map's  put and remove methods to register and
unregister SolrInfoMBean in MBeanServer. 
> Later on, I am planning to use register and unregister methods in SolrInfoRegistry and
removing getRegistry() method (Hiding the map instance to other classes)

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