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Solr Master/Slave configuration

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Index Replication distributes complete copies of a master index to one or more slave servers. The master server continues to manage updates to the index. All querying is handled by the slaves. This division of labor enables Solr to scale to provide adequate responsiveness to queries against large search volumes.


1.   Prerequisite Software 
·         JAVA ( install it from https://java.com/en/download/)
·         NSSM 2.24 ( Non Sucking Service manager) https://nssm.cc/release/nssm-2.24.zip

2.   Setup Solr Instance

           A)   Setup Solr instance for Master 
        ·         Follow below link to setup Solr as Master 

 https://www.sitecorebites.net/2019/12/setup-solr-as-window-service.html

              Ex : D:\SolrPOC\Solr\Master\Solr-4.5.1\

  B)   Setup Solr instance for Slave
        ·     Follow below link to setup Solr as Slave
https://www.sitecorebites.net/2019/12/setup-solr-as-window-service.html

          Ex : D:\SolrPOC\Solr\Slave\Solr-4.5.1\

3.   Configuring the ReplicationHandler
      Solr includes a Java implementation of index replication that works over HTTP:

  •     The configuration affecting replication is controlled by a single file, solrconfig.xml
  •     Supports the replication of configuration files as well as index files
  •     Works across platforms with same configuration
  •     No reliance on OS-dependent file system features (eg: hard links)
  •    Tightly integrated with Solr; an admin page offers fine-grained control of each aspect of replication

3.1  Master Solr Configuration : Configuring the Replication RequestHandler on a Master Server
·         For CMS connection master solr configuration required.

-       Master URL : http://localhost:8983/solr/
·         Open the solrconfig.xml file from (solr-5.4.1\server\solr\ sitecore_core_index \conf) for each core which wanted to sync the data with slave. Ex : ap_web_index, na_web_index and eu_web_index.

·         Add replication request handler configuration to solrconfig.xml for above indexes


<requestHandler name="/replication" class="solr.ReplicationHandler" >

    <lst name="master">

      <str name="replicateAfter">commit</str>

      <str name="replicateAfter">optimize</str>        

      <str name="backupAfter">commit</str>     

      <str name="confFiles">schema.xml</str>

      <str name="commitReserveDuration">00:00:10</str>

    </lst>

    <int name="maxNumberOfBackups">2</int>

    <lst name="invariants">

      <str name="maxWriteMBPerSec">16</str>

    </lst>

  </requestHandler>


3.2  Slave Solr Configuration : Configuring the Replication RequestHandler on a Slave Server
·         For CD connection slave configuration require

-       Slave URL : http://localhost:8984/solr/
·         Open the solrconfig.xml file from (solr-5.4.1\server\solr\ sitecore_core_index \conf) for each core, which is synced by Master Ex : ap_web_index, na_web_index and eu_web_index.

·         In solrconfig.xml, add replication request handler configuration to solrconfig.xml for above indexes.

Note: Master url will be “Solr Master” url.


<requestHandler name="/replication" class="solr.ReplicationHandler" >

        <lst name="slave">

       <str name="masterUrl">http://localhost:8983/solr/sitecore_core_index/replication</str>

      <str name="pollInterval">00:00:20</str>

          </lst>

  </requestHandler>

3.3 Update the core properties:  
           Set the following properties in the solrcore.properties file

enable.master=true
enable.slave=false


3.4 Troubleshooting the replication: 
      A) Restart both master as well slave solr service
     B) Open both Solr UI & validate whether master and slave configured properly or not as below image




     C) Validate the replication
·         Open Slave Solr UI  : http://localhost:8984/solr
·         Select the core Ex : sitecore_core_index
·         Click on Replication and see the replication interval as below




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