Apache Solr is an open-source search platform that provides indexing and search capabilities for web applications and other types of data-driven applications. Solr is built on top of Apache Lucene, which is a high-performance search engine library written in Java.

SearchStax Cloud is a fully-managed SaaS solution that automates, manages, maintains and scales Solr search infrastructure in public or private clouds.

Core features include:

• High Availability Solr or HA Solr
• Cloud automation
• Monitoring and alerting
• Automated backups
• Disaster recovery options to meet every business need
• Available on AWS, Azure and Google in over 60 regions
• On-demand scaling
• Roles and permissions

1. Requesting a large number of rows
2. Queries starting at a large page number
3. Faceting, sorting and grouping queries
4. Large caches

Download Solr Out-of-Memory (OOM): Causes and Solutions White Paper