Cross Data Center Replication (CDCR) - Apache Solr Reference Guide - Apache Software Foundation
The SolrCloud architecture is not particularly well suited for situations where a single SolrCloud cluster consists of nodes in separated data clusters connected by an expensive pipe. The root problem is that SolrCloud is designed to support Near Real Time Searching by immediately forwarding updates between nodes in the cluster on a per-shard basis. "CDCR" features exist to help mitigate the risk of an entire Data Center outage.
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