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Solr replication: advantages and disadvantages

There are advantages and disadvantages of using a master-slave replication.

A system with master-slave index replication offers the following advantages and disadvantages:

Advantages
  • Splits read and write load and operations
  • Load distribution for search queries
  • High availability for searching
  • Any number of slave instances can be created to scale query performance
  • Usually less frequent index updates on the slaves and better use of the cache
Disadvantages
  • Increased latency (sum of tracking and Solr replication latency)
  • Occasional large IO load to replicate large merges
  • Complicated load balance and management
  • Reconfiguration if the master is lost

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