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The "UpdateXmlMessages" page has been changed by LukasGraf:
http://wiki.apache.org/solr/UpdateXmlMessages?action=diff&rev1=41&rev2=42

Comment:
Added hint about updateLog directive (required for atomic updates)

  </add>
  }}}
  
+ <!> Important: In order to use atomic updating, you need to have an 
`updateLog` configured in your `solrconfig.xml`:
+    {{{
+   <updateHandler class="solr.DirectUpdateHandler2">
+   <!-- ... -->
+     <updateLog>
+       <str name="dir">${solr.data.dir:}</str>
+     </updateLog>
+   </updateHandler>
+ }}}
+ 
+ 
  === "commit" and "optimize" ===
  
  A commit operation makes index changes visible to new search requests.

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