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From: Apache Wiki <wikidiffs@apache.org>
To: solr-commits@lucene.apache.org
Date: Mon, 10 Aug 2009 11:05:01 -0000
Message-ID: <20090810110501.22779.39734@eos.apache.org>
Subject: [Solr Wiki] Update of "SolrReplication" by ShalinMangar
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Dear Wiki user,

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The following page has been changed by ShalinMangar:
http://wiki.apache.org/solr/SolrReplication

The comment on the change is:
Added example for repeater

------------------------------------------------------------------------------
  <!> ["Solr1.4"]
+ 
+ [[TableOfContents]]
  
  = Features =
   * Replication without requiring external scripts
@@ -16, +18 @@

  
  The new Java-based replication feature is implemented as a !RequestHandler. Configuring replication is therefore similar to any normal !RequestHandler.
  
- === in master: ===
+ === Master ===
  {{{
  <requestHandler name="/replication" class="solr.ReplicationHandler" >
      <lst name="master">
@@ -45, +47 @@

  
  On the master server, the file name of the slave configuration file can be anything, as long as the name is correctly identified in the "confFiles" string; then it will be saved as whatever file name appears after the colon ':'.
   
- === in slave: ===
+ === Slave ===
  {{{
  <requestHandler name="/replication" class="solr.ReplicationHandler" >
      <lst name="slave">
@@ -83, +85 @@

  === Setting up a Repeater ===
  A master may be able to serve only so many slaves without affecting performance. Some organizations have deployed slave servers across multiple data centers. If each slave downloads the index from a remote data center, the resulting download may consume too much network bandwidth. To avoid performance degradation in cases like this, you can configure one or more slaves as repeaters.  A repeater is simply a node that acts as both a master and a slave.
   * To configure a server as a repeater, both the master and slave configuration lists need to be present inside the !ReplicationHandler requestHandler in the solrconfig.xml file.
+  * Be sure to have replicateAfter 'commit' setup on repeater even if replicateAfter is set to optimize on the main master. This is because on a repeater (or any slave), only a commit is called after index is downloaded. Optimize is never called on slaves.
  
- 
+ Example configuration of a repeater:
+ {{{
+ <requestHandler name="/replication" class="solr.ReplicationHandler">
+     <lst name="master">
+       <str name="replicateAfter">commit</str>
+       <str name="confFiles">schema.xml,stopwords.txt,synonyms.txt</str>
+     </lst>
+     <lst name="slave">
+       <str name="masterUrl">http://master.solr.company.com:8080/solr/replication</str>
+       <str name="pollInterval">00:00:60</str>
+     </lst>
+   </requestHandler>
+ }}}
  
  = Replication Dashboard =
  This shows the following information