The SolrCloud solution
SolrCloud provides the high availability and failover solution for an index spanning over multiple Solr servers. If we go ahead with the traditional master-slave model and try implementing a sharded Solr cluster, we will need to create multiple master Solr servers, one for each shard and then slaves for these master servers. We need to take care of the sharding algorithm so that data is distributed across multiple shards. A search has to happen across these shards. Also, we need to take care of any shard that goes down and create a failover setup for the same. Load balancing of search queries is manual. We need to figure out how to distribute the search queries across multiple shards.
SolrCloud handles the scalability challenge ...
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