There are a few requestHandlers that fetch various bits of information about the Solr instance, and a given core.

LukeRequestHandler

See LukeRequestHandler.

SystemInfoHandler

Solr1.4

The SystemInfoHandler returns a snapshot of the operating environment of a given Solr instance: basic data, Solr & Lucene version data, Java VM information, JMX accessibility, and operation system. As of this writing, the servlet engine or embedded Solr status is not gathered.

Parameters

None.

Example Output

http://localhost:8983/solr/admin/system?indent=on

<lst name="core">

 <str name="schema">example</str>

 <str name="host">norskhaus</str>

 <date name="now">2010-07-06T05:49:12.405Z</date>

 <date name="start">2010-07-06T05:48:55.527Z</date>

 <lst name="directory">

  <str name="instance">C:\cygwin\home\work\open\solr-1.4\release-1.4.1\example\

olr</str>

  <str name="data">C:\cygwin\home\work\open\solr-1.4\release-1.4.1\example\.\so

r\data</str>

  <str name="index">C:\cygwin\home\work\open\solr-1.4\release-1.4.1\example\sol

\data\index</str>

 </lst>

</lst>

<lst name="lucene">

 <str name="solr-spec-version">1.4.1.2010.07.01.16.02.55</str>

 <str name="solr-impl-version">1.4.2-dev 959792M - work - 2010-07-01 16:02:55</

tr>

 <str name="lucene-spec-version">2.9.3</str>

 <str name="lucene-impl-version">2.9.3 951790 - 2010-06-06 01:30:55</str>

</lst>

<lst name="jvm">

 <str name="version">14.0-b16</str>

 <str name="name">Java HotSpot(TM) 64-Bit Server VM</str>

 <int name="processors">2</int>

 <lst name="memory">

  <str name="free">88.1 MB</str>

  <str name="total">109.4 MB</str>

  <str name="max">910.2 MB</str>

  <str name="used">21.3 MB (%2.3)</str>

 </lst>

 <lst name="jmx">

  <str name="bootclasspath">C:\Program Files\Java\jdk1.6.0_14\jre\lib\resources

jar;C:\Program Files\Java\jdk1.6.0_14\jre\lib\rt.jar;C:\Program Files\Java\jdk1

6.0_14\jre\lib\sunrsasign.jar;C:\Program Files\Java\jdk1.6.0_14\jre\lib\jsse.ja

;C:\Program Files\Java\jdk1.6.0_14\jre\lib\jce.jar;C:\Program Files\Java\jdk1.6

0_14\jre\lib\charsets.jar;C:\Program Files\Java\jdk1.6.0_14\jre\classes</str>

  <str name="classpath">C:\cygwin\home\work\open\solr-1.4\release-1.4.1\example

C:\cygwin\home\work\open\solr-1.4\release-1.4.1\example\lib\jetty-6.1.3.jar;C:\

ygwin\home\work\open\solr-1.4\release-1.4.1\example\lib\jetty-util-6.1.3.jar;C:

cygwin\home\work\open\solr-1.4\release-1.4.1\example\lib\servlet-api-2.5-6.1.3.

ar;C:\cygwin\home\work\open\solr-1.4\release-1.4.1\example\lib\jsp-2.1\ant-1.6.

.jar;C:\cygwin\home\work\open\solr-1.4\release-1.4.1\example\lib\jsp-2.1\core-3

1.1.jar;C:\cygwin\home\work\open\solr-1.4\release-1.4.1\example\lib\jsp-2.1\jsp

2.1.jar;C:\cygwin\home\work\open\solr-1.4\release-1.4.1\example\lib\jsp-2.1\jsp

api-2.1.jar</str>

  <arr name="commandLineArgs"/>

  <date name="startTime">2010-07-06T05:48:53.405Z</date>

  <long name="upTimeMS">19001</long>

 </lst>

</lst>

<lst name="system">

 <str name="name">Windows Vista</str>

 <str name="version">6.0</str>

 <str name="arch">amd64</str>

 <double name="systemLoadAverage">-1.0</double>

</lst>

</response>

SolrInfoMBeanHandler

Solr3.1 This handler returns a full inventory of the SolrMBean objects in the instance. These include most of the heavyweight objects in Solr. It is generally a replacement for admin/stats.jsp, and makes rolling your own monitoring of Solr without using JMX much simpler.

Example URLs

Assuming you have this handler mapped to "/admin/mbeans" in solrconfig.xml and are running the example on port localhost:8983, visit:

• /admin/mbeans

• /admin/mbeans?stats=true

• /admin/mbeans?stats=true&cat=CORE

• /admin/mbeans?stats=true&cat=CORE&cat=CACHE

• /admin/mbeans?stats=true&cat=CACHE&key=queryResultCache

• /admin/mbeans?stats=true&cat=CACHE&key=queryResultCache&key=filterCache

• /admin/mbeans?stats=true&cat=CACHE&key=queryResultCache&wt=json&indent=true

ThreadDumpHandler

Gives a list of all of the threads in the Java VM. Equivalent to the Java thread dump feature.