https://doi.org/10.1051/epjconf/202429501024
Erasure Coding XRootD Object Store
1 SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA, USA
2 European Organization for Nuclear Research, Espl. des Particules 1, 1211 Meyrin, Switzerland
* Corresponding author: yangw@slac.stanford.edu
Published online: 6 May 2024
An erasure coding (EC) algorithm was implemented in XRootD client library, and an EC-enabled XRootD storage prototype was set up at SLAC for evaluation. The architecture and configuration of the prototype is almost identical to that of a traditional non-EC XRootD storage behind a firewall: a backend XRootD storage cluster in its simplest form, and an internet facing XRootD proxy. This proxy handles EC and spreads the data stripes of a file/object across several backend nodes. It also supports all functions used on a WLCG storage system: HTTP(s) and XRootD protocols, Third Party Copy, X509/VOMS/Token, etc. The cross-node EC architecture brings significant advantages in both performance and resilience: e.g. parallel data access, tolerance of downtime and hardware failure. It also pushes the preferred network-IO mode from Posix-like to object-like. This paper will describe the prototype’s architecture and its design choices, the performance in high concurrent throughputs and file/object operations, failure modes and their handling, data recovery methods, and administration.
© The Authors, published by EDP Sciences, 2024
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
