Replication is a critical feature in Apache Solr that allows you to maintain multiple copies of your search index on different servers. Here’s a brief overview of how to use replication in Solr:
1. The “replication” handler: Replication in Solr is implemented using the “replication” handler, which is a built-in Solr component that can be used to replicate search indexes between Solr servers.
2. Configuring replication: To configure replication in Solr, you need to add the “replication” handler to the Solr configuration on both the source and target servers. You can do this by adding the following lines to the “solrconfig.xml” file on each server:
xmlcommit optimize /path/to/index http://source_server:port/solr/core_name/replication 00:00:10
This code specifies that the “replication” handler should be used for replication, the “indexPath” parameter should be set to the path of the search index on the source server, and the “masterUrl” parameter should be set to the URL of the “replication” handler on the source server.
3. Using replication: Once replication is configured in Solr, you can use the “replication” handler to replicate search indexes between servers. To initiate replication, you can use the following URL on the target server:
http://localhost:8983/solr/core_name/replication?command=fetchindex
This URL specifies that the “fetchindex” command should be used to initiate replication.
By using replication in Solr, you can maintain multiple copies of your search index on different servers, providing redundancy and high availability. The Solr documentation provides detailed information on how to configure and use the replication feature to replicate search indexes between Solr servers.