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The "MergingSolrIndexes" page has been changed by MarcUbaldino: http://wiki.apache.org/solr/MergingSolrIndexes?action=diff&rev1=11&rev2=12 1. Find the lucene jar file that your version of solr is using. You can do this by copying your solr.war file somewhere and unpacking it (jar xvf solr.war). Your lucene jar file should be in WEB-INF/lib. It is probably called something like lucene-core-2007-05-20_00-04-53.jar. Copy it somewhere easy to find. 1. Download a copy of lucene from http://www.apache.org/dyn/closer.cgi/lucene/java/ and unpack it. The file you're interested in is contrib/misc/lucene-misc-VERSION.jar 1. Make sure both indexes you want to merge are closed. - 1. Issue this command: {{{java -cp /path/to/lucene-core-VERSION.jar:/path/to/lucene-misc-VERSION.jar org/apache/lucene/misc/IndexMergeTool /path/to/newindex /path/to/index1 /path/to/index2}}} This will create a new index at {{{/path/to/newindex}}} that contains both index1 and index2. Copy this new directory to the location of your application's solr index (move the old one aside first, of course) and start solr. + 1. Issue this command: {{{java -cp /path/to/lucene-core-VERSION.jar:/path/to/lucene-misc-VERSION.jar org.apache.lucene.misc.IndexMergeTool /path/to/newindex /path/to/index1 /path/to/index2}}} This will create a new index at {{{/path/to/newindex}}} that contains both index1 and index2. Copy this new directory to the location of your application's solr index (move the old one aside first, of course) and start solr. === Example === The command below assumes that the files {{{lucene-core-3.4.0.jar}}} and {{{lucene-misc-3.4.0.jar}}} are in the current directory: {{{ - java -cp lucene-core-3.4.0.jar:lucene-misc-3.4.0.jar org/apache/lucene/misc/IndexMergeTool ./newindex ./app1/solr/data/index ./app2/solr/data/index + java -cp lucene-core-3.4.0.jar:lucene-misc-3.4.0.jar org.apache.lucene.misc.IndexMergeTool ./newindex ./app1/solr/data/index ./app2/solr/data/index }}}
