Prerequisites
Solr Prerequisites
Ranger supports Apache Solr 5.2 or higher.
Apache Solr requires the Java Runtime Environment (JRE) version 1.7 or higher.
1 TB free space in the volume where Solr will store the index data.
32 GB RAM.
SolrCloud Prerequisites
SolrCloud supports replication and sharding. It is highly recommended that you use SolrCloud with at least two Solr nodes running on different servers with replication enabled.
SolrCloud requires Apache ZooKeeper.