Apache Solr includes the ability to set up a cluster of Solr servers that combines fault tolerance and high availability. Called SolrCloud, these capabilities provide distributed indexing and search capabilities, supporting the following features:
- Central configuration for the entire cluster
- Automatic load balancing and fail-over for queries
- ZooKeeper integration for cluster coordination and configuration.
SolrCloud is flexible distributed search and indexing, without a master node to allocate nodes, shards and replicas. Instead, Solr uses ZooKeeper to manage these locations, depending on configuration files and schemas. Documents can be sent to any server and ZooKeeper will figure it out.
In this section, we'll cover everything you need to know about using Solr in SolrCloud mode. We've split up the details into the following topics:
- Getting Started with SolrCloud
- How SolrCloud Works
- SolrCloud Configuration and Parameters
- Rule-based Replica Placement