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From Chris Hostetter <>
Subject Re: Any documentation on Solr MBeans?
Date Fri, 08 Mar 2013 01:03:54 GMT

: I'm trying to monitor some Solr behaviour, using JMX.
: It looks like a great job was done there, but I can't find any
: documentation on the MBeans themselves.

In general, the stats exposed by the various MBeans are going to largely 
depend on the underlying plugin classes -- in most cases they are 
hopefully self explaining, but in cases where they aren't, your best bet 
is to skim the code.

: For example, DirectUpdateHandler2 attributes. What is the difference
: between "adds" and "cumulative_adds"? Is "adds" count the last X seconds
: only? or maybe "cumulative_adds" survives a core reload?

as mark mentioned, i don't think any stats survive a core reload, because 
almost everything implementing MBean is created/destroyed along with the 

In the specific case of DirectUpdateHandler2, the "cumulative_* 
stats refer to the total number for hte life of the DUH2 instance, which 
the non cumlative stats are reset on commit.


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