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Make sure the masterUrl ends with /solr/alfresco. If this is missing, the slave server does not poll automatically.įully qualified URL for the replication handler of master. Interval in which the slave should poll master. To configure the slave server, follow the steps below: Here again, the solrconfig.xml file controls the configuration affecting replication. Make sure that the solrcore.properties file has the following settings: enable.master=true If you use startup, you need to have a commit and/or optimize entry also if you want to trigger replication on future commits or optimizes.Ĭomma-separated list of configuration files to replicate. There can be multiple values for this parameter. Valid values are, commitwhich triggers replication whenever a commit is performed on the master index, optimize which triggers replication whenever the master index is optimized and startup which triggers replication whenever the master index starts up. String specifying action after which replication should occur. Remember to uncomment the master section. To configure the master server, follow the steps below:Įdit the alresco-search-services/solrhome/templates/re-rank/conf/solrconfig.xml file on the master server to change the default replication handler configuration. The configuration affecting replication is controlled by a single file, alresco-search-services/solrhome/templates/re-rank/conf/solrconfig.xml. The Alfresco Content Services instance is configured to send all the queries to the SOLR slave.Ĭonfiguring the Alfresco Content Services instanceĪs usual, no SSL queries configured go to the slave. The Solr master is configured to track the Alfresco Content Services instance while the Solr slave is configured to track the Solr master. The simplest configuration involves one Alfresco Content Services node, one Solr master, and one Solr slave. The Solr replication feature is implemented as a RequestHandler. Requires an additional master node, so has slightly higher pre-requisites.
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But if the master node went down, then intervention would be required to Designate a new master, then point the slaves to that new master, and then Point the new master to the repository If a slave node went down, the same load-balancer behaviour would be relied on. If a master node went down, the load balancer will direct all the query requests to a Solr node that was still running. Neither the master-master replication nor the master-slave replication includes any inbuilt functionality to switch Solr targets, in case one node fails. For example, the master node can be configured for optimal indexing performance, while the slave node can be configured for optimal search performance. In the master-slave replication, the master and slave nodes can be configured to perform better under different situations. In a master-master replication, the master nodes can’t be configured to perform differently in different situations. It takes slightly longer in a master-slave replication because first the master index is updated and then that index change is replicated to the slave. Solr indexing is eventually consistent irrespective of the method used. It is not as simple as the master-master replication.Īchieves eventual consistency much more quickly than the master-slave replication. Each Solr node may have the same setup if the queries from Solr to the repository go through a load balancer instead of to a specific repository node. The slave servers only pull the completed indexes. Only the master server indexes or re-indexes. Requires all Solr nodes to do the leg-work of indexing. Complicated load balance and managementĭifference between the master-master and master-slave replication Master-master replication.Occasional large IO load to replicate large merges.Increased latency (sum of tracking and Solr replication latency).Usually less frequent index updates on the slaves and better use of the cache.Any number of slave instances can be created to scale query performance.Splits read and write load and operations.Advantages and disadvantages of a master-slave index replication Advantages The master-slave replication requires non-SSL communication between the master server and the slave server. The master server’s index is replicated on the slaves. The figure below shows a Solr configuration using index replication. This enables Solr to remain responsive even with high query traffic.Īll trackers must be enabled on master nodes, while only model tracker and metadata tracker should be enabled on slaves. Changes made on the master are distributed to all the slave servers which service all query requests from the clients. The master server receives all updates and all changes are made against a single master server. Solr replication uses the master-slave model to distribute complete copies of a master index to one or more slave servers.