In the last chapter, we have seen how Apache Solr can be optimized for better performance on a single node as well as a cluster of nodes. Apache Solr can be scaled horizontally or vertically. Horizontal scaling focuses on adding additional nodes for better distribution of search over multiple machines. Vertical scaling involves adding more resources to the current node setup, such as CPU cores, RAM, or other hardware components. Solr can be scaled in both cases. The IT industry today is keen to look for a way to increase capacity or add capabilities on the fly without investing in new infrastructure, or licensing new software. This requirement highlights the importance of Cloud computing, which provides a subscription-based or pay-for-usage-based service to enable the IT industry to explore new horizons at minimal cost.

In this chapter, we are going to look at how Apache Solr can work with Cloud computing in detail. We will cover the following topics: