xDGP: A Dynamic Graph Processing System with Adaptive Partitioning

Abstract

Many real-world systems, such as social networks, rely on mining efficiently large graphs, with hundreds of millions of vertices and edges. This volume of information requires partitioning the graph across multiple nodes in a distributed system. This has a deep effect on performance, as traversing edges cut between partitions incurs a significant performance penalty due to the cost of communication. Thus, several systems in the literature have attempted to improve computational performance by enhancing graph partitioning, but they do not support another characteristic of realworld graphs: graphs are inherently dynamic, their topology evolves continuously, and subsequently the optimum partitioning also changes over time.In this work, we present the first system that dynamically repartitions massive graphs to adapt to structural changes. The system optimises graph partitioning to prevent performance degradation without using data replication. The system adopts an iterative vertex migration algorithm that relies on local information only, making complex coordination unnecessary. We show how the improvement in graph partitioning reduces execution time by over 50%, while adapting the partitioning to a large number of changes to the graph in three real-world scenarios.

Graph Computing Systems and Partitioning Techniques: A Survey

“…The main differences among dynamic vertex partitioning are how to choose vertices for migration, selecting target partition, and how to exchange vertices. xDGP [56], X-Pregel [57], Mizan [58], GPS [29], and LogGP [152] graph processing systems integrate their own dynamic vertex partitioning. xDGP uses adaptive iterative partitioning, which performs an iterative vertex migration, relying only on local information.…”

“…One edge set is partitioned in the offline approach, and another edge set is partitioned in the stream [54], [55]. The dynamic approach has been proposed for repartitioning when the graphs' topology is dynamically changed [56]- [58].…”