Efficient Multi-site Data Movement Using Constraint Programming for Data Hungry Science

TL;DR

This paper presents a constraint programming approach for optimizing multi-site data transfers and placements in distributed scientific computing, improving efficiency and reducing waiting times for data-hungry experiments.

Contribution

It introduces a novel CP-based model for data transfer and placement planning, with enhancements for faster scheduling and practical implementation in scientific data management.

Findings

CP approach reduces data transfer scheduling time.

Enhanced solver techniques improve scalability and efficiency.

Comparison shows CP outperforms Peer-2-Peer models in real scenarios.

Abstract

For the past decade, HENP experiments have been heading towards a distributed computing model in an effort to concurrently process tasks over enormous data sets that have been increasing in size as a function of time. In order to optimize all available resources (geographically spread) and minimize the processing time, it is necessary to face also the question of efficient data transfers and placements. A key question is whether the time penalty for moving the data to the computational resources is worth the presumed gain. Onward to the truly distributed task scheduling we present the technique using a Constraint Programming (CP) approach. The CP technique schedules data transfers from multiple resources considering all available paths of diverse characteristic (capacity, sharing and storage) having minimum user's waiting time as an objective. We introduce a model for planning data transfers to a single destination (data transfer) as well as its extension for an optimal data set spreading strategy (data placement). Several enhancements for a solver of the CP model will be shown, leading to a faster schedule computation time using symmetry breaking, branch cutting, well studied principles from job-shop scheduling field and several heuristics. Finally, we will present the design and implementation of a corner-stone application aimed at moving datasets according to the schedule. Results will include comparison of performance and trade-off between CP techniques and a Peer-2-Peer model from simulation framework as well as the real case scenario taken from a practical usage of a CP scheduler.