The strength of an open source project resides entirely in its developer community; a strong democratic culture of participation and hacking makes for a better piece of software. The key requirement is having developers who are not only willing to contribute, but also knowledgeable about the project’s internal structure and architecture. This session will introduce developers to the core internal architectural concepts of HBase, not just “what” it does from the outside, but “how” it works internally, and “why” it does things a certain way. We’ll walk through key sections of code and discuss key concepts like the MVCC implementation and memstore organization. The goal is to convert serious “HBase Users” into HBase Developer Users”, and give voice to some of the deep knowledge locked in the committers’ heads.