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From Apache Wiki <wikidi...@apache.org>
Subject [Solr Wiki] Update of "MergingSolrIndexes" by JayHill
Date Wed, 10 Feb 2010 23:56:32 GMT
Dear Wiki user,

You have subscribed to a wiki page or wiki category on "Solr Wiki" for change notification.

The "MergingSolrIndexes" page has been changed by JayHill.
http://wiki.apache.org/solr/MergingSolrIndexes?action=diff&rev1=8&rev2=9

--------------------------------------------------

  ##acl MoinPagesEditorGroup:read,write,delete,revert All:read
  #format wiki
  #language en
- 
  = Merging Solr Indexes =
  Sometimes you have more than one Solr index and you want to merge them together into a single
index.
  
@@ -17, +16 @@

  <!> [[Solr1.4]]
  
  !CoreAdminHandler now supports merging one or more indexes into another index (since Solr
1.4).
+ 
  {{{
  http://localhost:8983/solr/admin/cores?action=mergeindexes&core=core0&indexDir=/opt/solr/core1/data/index&indexDir=/opt/solr/core2/data/index
  }}}
@@ -24, +24 @@

  
  Before executing this command, one must make sure to call commit on core1 and core2 (in
order to close !IndexWriter) and no writes should happen on core1 and core2 until the merge
command completes. Failure to do so may corrupt the core0 index. Once the merge is completed,
a commit should be called on core0 to make the changes visible to searchers.
  
+ '''NOTE''': In this example core0 must exist and have a compatible schema with core1 and
core2. The 'mergeindexes' command will not create a new core named 'core0' if it does not
already exist.
+ 
  == Merging Through Lucene IndexMergeTool ==
  Another way is to use the !IndexMergeTool that comes as part of lucene-misc. In order to
do this:
  
   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. 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 ===
  {{{
  java -cp /tmp/lucene-core-2007-05-20_00-04-53.jar:./lucene-2.2.0/contrib/misc/lucene-misc-2.2.0.jarorg/apache/lucene/misc/IndexMergeTool
./newindex ./app1/solr/data/index ./app2/solr/data/index
- }}} 
+ }}}
  

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