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From Apache Wiki <>
Subject [Solr Wiki] Update of "SolrConfigXml" by JanHoydahl
Date Fri, 22 Jun 2012 00:09:47 GMT
Dear Wiki user,

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The "SolrConfigXml" page has been changed by JanHoydahl:

Updating about indexConfig

- == indexDefaults Section ==
- /!\ :TODO: /!\ Still need a section explaining indexDefaults
- == mainIndex Section ==
+ == indexConfig Section ==
+ <!> [[Solr3.6]]
+ These settings control low-level behavior of indexing. Please see comments in the example
solrconfig.xml for details.
+ Note: In versions prior to 3.6, there were two different sections named <indexDefaults>
and <mainIndex>, which are now replaced with this one <indexConfig> section. You
can still use the old config as is in 3.6 and 4.x, but need to migrate when bumping luceneMatchVersion.
Easiest way to migrate is to start with the example <indexConfig> section which has
everything commented out, using the defaults, and then customize if necessary.
- The values in this section controls the merging of multiple index segments. See the `mergeFactor`
Considerations section on the SolrPerformanceFactors doc for more details.
- {{{
-    <mainIndex>
-     <!-- lucene options specific to the main on-disk lucene index -->
-     <useCompoundFile>false</useCompoundFile>
-     <mergeFactor>10</mergeFactor>
-     <maxBufferedDocs>1000</maxBufferedDocs>
-     <maxMergeDocs>2147483647</maxMergeDocs>
-     <maxFieldLength>10000</maxFieldLength>
-   </mainIndex>
- }}}
- The `maxMergeDocs` parameter tells Lucene to not to allow any segment to contain more docs
than the value stipulated, but to create a new segment instead.
  == Update Handler Section ==
  The Update Handler section mostly relates to low level information about how updates are
handled internally (do not confuse with higher level configuration of "Request Handlers" for
dealing with updates sent by clients)

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