IncQuery-D: incremental graph search in the cloud

Queries are the foundations of data intensive applications. In model-driven software engineering (MDE), model queries are core technologies of tools and transformations. As software models are rapidly increasing in size and complexity, traditional MDE tools frequently exhibit scalability issues that decrease productivity and increase costs. While such scalability challenges are a constantly hot topic in the database community and recent efforts of the NoSQL movement have partially addressed many shortcomings, this happened at the cost of sacrificing the powerful ad-hoc query capabilities of SQL. Unfortunately, this is a critical problem for MDE applications, as their queries can be significantly more complex than in general database applications. In this paper, we aim to address this challenge by adapting incremental graph search techniques -- known from the EMF-IncQuery framework -- to the distributed cloud infrastructure. IncQuery-D, our prototype system can scale up from a single-node tool to a cluster of nodes that can handle very large models and complex queries efficiently. The feasibility of our approach is supported by early experimental results.