Event-Driven Messaging for Offline Data Quality Monitoring at ATLAS

21st International Conference on Computing in High Energy and Nuclear Physics

物理学;计算机科学

Onyisi, Peter^1

University of Texas at Austin, Austin

TX

78712, United States^1

关键词: Distributed systems;    Event-driven;    Information flows;    Message queues;    Offline data;    Reliable transmission;    Standard protocols;    Synchronization method;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/664/6/062045/pdf
DOI  :  10.1088/1742-6596/664/6/062045

学科分类：计算机科学（综合）

来源: IOP

【 摘 要 】

During LHC Run 1, the information flow through the offline data quality monitoring in ATLAS relied heavily on chains of processes polling each other's outputs for handshaking purposes. This resulted in a fragile architecture with many possible points of failure and an inability to monitor the overall state of the distributed system. We report on the status of a project undertaken during the LHC shutdown to replace the ad hoc synchronization methods with a uniform message queue system. This enables the use of standard protocols to connect processes on multiple hosts; reliable transmission of messages between possibly unreliable programs; easy monitoring of the information flow; and the removal of inefficient polling-based communication.