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Release Notes / Version 11.2210

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Changed Solr Terminology: Leader/Follower replaces Master/Slave

Apache Solr has replaced the names of their replication setup from Master/Slave to Leader/Follower. These names have now been changed in Solr configuration files ( solrconfig.xml ) and CoreMedia documentation. For details of the change in Solr, see https://solr.apache.org/guide/8_8/solr-upgrade-notes.html#solr-8-7 .

The following system properties used to configure Solr replication have been renamed. If you are using the old names in your project, you must update them accordingly:

  • solr.master.url -> solr.leader.url

  • solr.master -> solr.leader

  • solr.slave -> solr.follower

Environment variables for the Docker image have also changed. The old environment variables still work, but are deprecated:

  • SOLR_MASTER -> SOLR_LEADER

  • SOLR_MASTER_URL -> SOLR_LEADER_URL

  • SOLR_SLAVE -> SOLR_FOLLOWER

  • SOLR_SLAVE_AUTOCREATE_CORES -> SOLR_FOLLOWER_AUTOCREATE_CORES

  • SOLR_SLAVE_AUTOCREATE_CORES_LIST -> SOLR_FOLLOWER_AUTOCREATE_CORES_LIST

  • SOLR_SLAVE_AUTOCREATE_THRESHOLD -> SOLR_FOLLOWER_AUTOCREATE_THRESHOLD

The Maven commands to start and stop a Solr follower node for local development in apps/solr/modules/search/solr-config/pom.xml have also changed to use "follower" instead of "slave". For details, see the comments in that pom.xml file.

In addition to the system properties and environment variables, the following changes have been applied:

  • The default log-location for Solr followers changed: slave-logs/ -> follower-logs/

  • To start a Solr follower locally, you now need to call mvn exec:exec@start-solr-follower (instead of mvn exec:exec@start-solr-slave ).

(CMS-19302)

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