Scaling Apache Solr

Apache Solr architecture

In the previous section, we have gone through various key features supported by Apache Solr. In this section, we will look at the architecture of Apache Solr. Apache Solr is a J2EE-based application that internally uses Apache Lucene libraries to generate the indexes as well as to provide a user friendly search. Let's look at the Solr architecture diagram as follows:

The Apache Solr instance can run as a single core or multicore; it is a client-server model. In case of a multicore, however, the search access pattern can differ. We are going to look into this in the next chapter. Earlier, Apache Solr had a single core, which ...