Metadata exchange is crucial for efficient geo-distributed fog computing. Existing solutions for metadata exchange overlook geo-awareness or lack adequate failure tolerance. We propose HFCS, a novel hybrid communication system that combines hierarchical and peer-to-peer elements, along with edge pools. HFCS utilizes a gossip protocol for dynamic metadata exchange. In simulation, we investigate the impact of node density and edge pool size on HFCS performance. We observe a performance improvement for clustered node distributions, aligning well with real-world scenarios. HFCS outperforms a hierarchical and a P2P approach in task fulfillment at a slight cost to failure detection.

翻译：元数据交换对于高效的地理分布式雾计算至关重要。现有元数据交换方案忽视了地理感知特性或缺乏足够的容错能力。我们提出HFCS——一种融合层次化与点对点元素及边缘池的新型混合通信系统。HFCS采用八卦协议实现动态元数据交换。通过仿真实验，我们探究了节点密度和边缘池规模对HFCS性能的影响，观察到其在符合现实场景的集群节点分布下具有性能提升。HFCS在任务完成率上优于层次化方法和点对点方法，仅以轻微牺牲故障检测能力为代价。