From the post:
We at Cominvent have often had the need to visualize the internal architecture of Apache Solr in order to explain both the relationships of the components as well as the flow of data and queries. The result is this conceptual architecture diagram, clearly showing how Solr relates to the app-server, how cores relate to a Solr instance, how documents enter through an UpdateRequestHandler, through an UpdateChain and Analysis and into the Lucene index etc.
Very useful if you are using (or plan to use) Solr in connection with your topic mapping.
Also a reminder that graphic presentation, can, doesn’t always, force you to be clear about structure and relationships.