EPJ Web Conf.
Volume 245, 202024th International Conference on Computing in High Energy and Nuclear Physics (CHEP 2019)
|Number of page(s)||7|
|Section||4 - Data Organisation, Management and Access|
|Published online||16 November 2020|
XRootD Third Party Copy for the WLCG and HLLHC
Science and Technology Facilities Council, United Kingdom
2 Morgridge Institute for Research, United States
3 University of Bonn, Germany
4 European Organization for Nuclear Research (CERN), Switzerland
5 SLAC National Accelerator Laboratory, United States
6 Brookhaven National Laboratory, United States
7 Fermi National Accelerator Laboratory, United States
8 Deutsches Elektronen-Synchrotron (DESY), Germany
9 University of Oklahoma, United States
* Corresponding author : email@example.com
Published online: 16 November 2020
A Third Party Copy (TPC) mechanism has existed in the pure XRootD storage environment for many years. However, using the XRootD TPC in the WLCG environment presents additional challenges due to the diversity of the storage systems involved such as EOS, dCache, DPM and ECHO, requiring that we carefully navigate the unique constraints imposed by these storage systems and their site-specific environments through customized configuration and software development. To support multitenant setups seen at many WLCG sites, X509 based authentication and authorization in XRootD was significantly improved to meet both security and functionality requirements. This paper presents architecture of the pull based TPC with optional X509 credential delegation, and how it is implemented in native XRootD and dCache. The paper discusses technical requirements, challenges, design choices and implementation details in the WLCG storage systems, as well as in FTS/gfal2. It also outlines XRootD’s plan to support newer TPC and security models such as token based authorization.
© The Authors, published by EDP Sciences, 2020
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