TEGRA: Efficient Ad-Hoc Analytics on Evolving Graphs

Several emerging evolving graph application workloads demand support for efficient ad-hoc analytics-the ability to perform ad-hoc queries on arbitrary time windows of the graph. We present TEGRA, a system that enables efficient adhoc window operations on evolving graphs. TEGRA allows efficient access to the state of the graph at arbitrary windows, and significantly accelerates ad-hoc window queries by using a compact in-memory representation for both graph and intermediate computation state. For this, it leverages persistent data structures to build a versioned, distributed graph state store, and couples it with an incremental computation model which can leverage these compact states. For users, it exposes these compact states using Timelapse, a natural abstraction. We evaluate TEGRA against existing evolving graph analysis techniques, and show that it significantly outperforms state-ofthe-art systems (by up to 30×) for ad-hoc window operation workloads.