Using Apache Solr for Ranger Audits: Prerequisites
Your cluster must meet some prerequisites before it can use Apahce Solr for Ranger audits.
Solr Prerequisites
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Ranger supports Apache Solr 5.2 or higher.
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Apache Solr requires the Java Runtime Environment (JRE) version 1.7 or higher.
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1 TB free space in the volume where Solr will store the index data.
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32 GB RAM.
SolrCloud Prerequisites
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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.
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SolrCloud requires Apache ZooKeeper.
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SolrCloud with Kerberos requires Apache ZooKeeper and MIT Kerberos.