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Capability-based Scheduling of Scientific Workflows in the Cloud

: Krämer, Michel

Fulltext urn:nbn:de:0011-n-5968527 (868 KByte PDF)
MD5 Fingerprint: abb73121a49801dad26db7cf3c74d530
(CC) by-nc-nd
Created on: 23.7.2020

Hammoudi, Slimane (Ed.) ; Institute for Systems and Technologies of Information, Control and Communication -INSTICC-, Setubal:
9th International Conference on Data Science, Technology and Applications 2020. Proceedings. Vol.1 : 7 - 9 July, 2020, web-based event
Setúbal: INSTICC, 2020
ISBN: 978-989-758-440-4
International Conference on Data Science, Technology and Applications (DATA) <9, 2020, Online>
Conference Paper, Electronic Publication
Fraunhofer IGD ()
Lead Topic: Visual Computing as a Service; Research Line: (Interactive) simulation (SIM); distributed systems; Cloud Computing

We present a distributed task scheduling algorithm and a software architecture for a system executing scientific workflows in the Cloud. The main challenges we address are (i) capability-based scheduling, which means that individual workflow tasks may require specific capabilities from highly heterogeneous compute machines in the Cloud, (ii) a dynamic environment where resources can be added and removed on demand, (iii) scalability in terms of scientific workflows consisting of hundreds of thousands of tasks, and (iv) fault tolerance because in the Cloud, faults can happen at any time. Our software architecture consists of loosely coupled components communicating with each other through an event bus and a shared database. Workflow graphs are converted to process chains that can be scheduled independently. Our scheduling algorithm collects distinct required capability sets for the process chains, asks the agents which of these sets they can manage, and then assigns process chains accordingly. We present the results of four experiments we conducted to evaluate if our approach meets the aforementioned challenges. We finish the paper with a discussion, conclusions, and future research opportunities. An implementation of our algorithm and software architecture is publicly available with the open-source workflow management system “Steep”.