New Replica Types in Solr 7

06/12/2018 - 11:50 to 12:30
long talk (40 min)

Session abstract: 

For the majority of cases, the current SolrCloud distributed indexing works great. There is a subset of use cases for which Solr's legacy Master/Slave replication may be a better fit, like cases where NRT is not required, and where read availability is more important than consistency. Solr 7 now ships with three different types of replicas to choose depending on different consistency and availability needs. With a combination of replica types, one can create a SolrCloud cluster that behaves like the Master/Slave architecture from Solr < 4.0 and provides separation of responsibilities (search vs index) while still getting most of the SolrCloud benefits, like high availability of writes, replica discovery, collections API, etc. This talk will be a deep dive into the new Replica Type feature: reasons for implementing it, differences between the types and how/why one would choose to use them, and implementation details of the feature.